diff --git a/package-lock.json b/package-lock.json
index 0cfd42d..c61ed6f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "map-grid",
-  "version": "1.0.0",
+  "version": "1.1.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -531,12 +531,14 @@
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       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.3.tgz",
-      "integrity": "sha512-tsFzPpcttalNjFBCFMqsKYQcWxxen1pgJR56by//QwvJc4/OUS3kPOOttx2tSIfjsylB0pYu7f5D3K1RCxUnUg=="
+      "integrity": "sha512-tsFzPpcttalNjFBCFMqsKYQcWxxen1pgJR56by//QwvJc4/OUS3kPOOttx2tSIfjsylB0pYu7f5D3K1RCxUnUg==",
+      "optional": true
     },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/abbrev/download/abbrev-1.1.1.tgz",
-      "integrity": "sha1-+PLIh60Qv2f2NPAFtph/7TF5qsg="
+      "integrity": "sha1-+PLIh60Qv2f2NPAFtph/7TF5qsg=",
+      "optional": true
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@@ -557,6 +559,7 @@
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-6.0.0.tgz",
       "integrity": "sha512-ZQl7LOWaF5ePqqcX4hLuv/bLXYQNfNWw2c0/yX/TsPRKamzHcTGQnlCjHT3TsmkOUVEPS3crCxiPfdzE/Trlhg==",
+      "optional": true,
       "requires": {
         "acorn": "^7.1.1",
         "acorn-walk": "^7.1.1"
@@ -571,7 +574,8 @@
     "acorn-walk": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
-      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA=="
+      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
+      "optional": true
     },
     "ajv": {
       "version": "6.12.2",
@@ -660,6 +664,7 @@
       "version": "1.1.5",
       "resolved": "http://registry.npm.taobao.org/are-we-there-yet/download/are-we-there-yet-1.1.5.tgz",
       "integrity": "sha1-SzXClE8GKov82mZBB2A1D+nd/CE=",
+      "optional": true,
       "requires": {
         "delegates": "^1.0.0",
         "readable-stream": "^2.0.6"
@@ -754,6 +759,7 @@
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
       "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "optional": true,
       "requires": {
         "safer-buffer": "~2.1.0"
       }
@@ -807,7 +813,8 @@
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "optional": true
     },
     "assign-symbols": {
       "version": "1.0.0",
@@ -851,7 +858,8 @@
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       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "optional": true
     },
     "atob": {
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@@ -862,12 +870,14 @@
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       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "optional": true
     },
     "aws4": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.10.0.tgz",
-      "integrity": "sha512-3YDiu347mtVtjpyV3u5kVqQLP242c06zwDOgpeRnybmXlYYsLbtTrUBUm8i8srONt+FWobl5aibnU1030PeeuA=="
+      "integrity": "sha512-3YDiu347mtVtjpyV3u5kVqQLP242c06zwDOgpeRnybmXlYYsLbtTrUBUm8i8srONt+FWobl5aibnU1030PeeuA==",
+      "optional": true
     },
     "axobject-query": {
       "version": "2.1.2",
@@ -1020,6 +1030,7 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
       "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "optional": true,
       "requires": {
         "tweetnacl": "^0.14.3"
       }
@@ -1151,7 +1162,8 @@
     "browser-process-hrtime": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-1.0.0.tgz",
-      "integrity": "sha512-9o5UecI3GhkpM6DrXr69PblIuWxPKk9Y0jHBRhdocZ2y7YECBFCsHm79Pr3OyR2AvjhDkabFJaDJMYRazHgsow=="
+      "integrity": "sha512-9o5UecI3GhkpM6DrXr69PblIuWxPKk9Y0jHBRhdocZ2y7YECBFCsHm79Pr3OyR2AvjhDkabFJaDJMYRazHgsow==",
+      "optional": true
     },
     "browserify-aes": {
       "version": "1.2.0",
@@ -1350,6 +1362,7 @@
       "version": "2.6.1",
       "resolved": "https://registry.npm.taobao.org/canvas/download/canvas-2.6.1.tgz",
       "integrity": "sha1-DQh91NYPWlqe+iAnVycKvqi++J4=",
+      "optional": true,
       "requires": {
         "nan": "^2.14.0",
         "node-pre-gyp": "^0.11.0",
@@ -1359,7 +1372,8 @@
     "caseless": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "optional": true
     },
     "catharsis": {
       "version": "0.8.11",
@@ -1600,7 +1614,8 @@
     "code-point-at": {
       "version": "1.1.0",
       "resolved": "http://registry.npm.taobao.org/code-point-at/download/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "optional": true
     },
     "collection-visit": {
       "version": "1.0.0",
@@ -1631,6 +1646,7 @@
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
       "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "optional": true,
       "requires": {
         "delayed-stream": "~1.0.0"
       }
@@ -1732,7 +1748,8 @@
     "console-control-strings": {
       "version": "1.1.0",
       "resolved": "http://registry.npm.taobao.org/console-control-strings/download/console-control-strings-1.1.0.tgz",
-      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
+      "optional": true
     },
     "constants-browserify": {
       "version": "1.0.0",
@@ -1882,12 +1899,14 @@
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       "version": "0.4.4",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.4.4.tgz",
-      "integrity": "sha512-p3pvU7r1MyyqbTk+WbNJIgJjG2VmTIaB10rI93LzVPrmDJKkzKYMtxxyAvQXR/NS6otuzveI7+7BBq3SjBS2mw=="
+      "integrity": "sha512-p3pvU7r1MyyqbTk+WbNJIgJjG2VmTIaB10rI93LzVPrmDJKkzKYMtxxyAvQXR/NS6otuzveI7+7BBq3SjBS2mw==",
+      "optional": true
     },
     "cssstyle": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-2.3.0.tgz",
       "integrity": "sha512-AZL67abkUzIuvcHqk7c09cezpGNcxUxU4Ioi/05xHk4DQeTkWmGYftIE6ctU6AEt+Gn4n1lDStOtj7FKycP71A==",
+      "optional": true,
       "requires": {
         "cssom": "~0.3.6"
       },
@@ -1895,7 +1914,8 @@
         "cssom": {
           "version": "0.3.8",
           "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
-          "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg=="
+          "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
+          "optional": true
         }
       }
     },
@@ -1915,6 +1935,7 @@
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
       "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
+      "optional": true,
       "requires": {
         "assert-plus": "^1.0.0"
       }
@@ -1923,6 +1944,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-2.0.0.tgz",
       "integrity": "sha512-X5eWTSXO/BJmpdIKCRuKUgSCgAN0OwliVK3yPKbwIWU1Tdw5BRajxlzMidvh+gwko9AfQ9zIj52pzF91Q3YAvQ==",
+      "optional": true,
       "requires": {
         "abab": "^2.0.3",
         "whatwg-mimetype": "^2.3.0",
@@ -1947,7 +1969,8 @@
     "decimal.js": {
       "version": "10.2.0",
       "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.2.0.tgz",
-      "integrity": "sha512-vDPw+rDgn3bZe1+F/pyEwb1oMG2XTlRVgAa6B4KccTEpYgF8w6eQllVbQcfIJnZyvzFtFpxnpGtx8dd7DJp/Rw=="
+      "integrity": "sha512-vDPw+rDgn3bZe1+F/pyEwb1oMG2XTlRVgAa6B4KccTEpYgF8w6eQllVbQcfIJnZyvzFtFpxnpGtx8dd7DJp/Rw==",
+      "optional": true
     },
     "decode-uri-component": {
       "version": "0.2.0",
@@ -1959,6 +1982,7 @@
       "version": "4.2.1",
       "resolved": "https://registry.npm.taobao.org/decompress-response/download/decompress-response-4.2.1.tgz",
       "integrity": "sha1-QUAjzHowLaJc4uyC0NUjjMr9iYY=",
+      "optional": true,
       "requires": {
         "mimic-response": "^2.0.0"
       }
@@ -1980,7 +2004,8 @@
     "deep-extend": {
       "version": "0.6.0",
       "resolved": "http://registry.npm.taobao.org/deep-extend/download/deep-extend-0.6.0.tgz",
-      "integrity": "sha1-xPp8lUBKF6nD6Mp+FTcxK3NjMKw="
+      "integrity": "sha1-xPp8lUBKF6nD6Mp+FTcxK3NjMKw=",
+      "optional": true
     },
     "deep-is": {
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@@ -2073,12 +2098,14 @@
     "delayed-stream": {
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       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
+      "optional": true
     },
     "delegates": {
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/delegates/download/delegates-1.0.0.tgz",
-      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
+      "optional": true
     },
     "depd": {
       "version": "1.1.2",
@@ -2111,7 +2138,8 @@
     "detect-libc": {
       "version": "1.0.3",
       "resolved": "http://registry.npm.taobao.org/detect-libc/download/detect-libc-1.0.3.tgz",
-      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups="
+      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
+      "optional": true
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     "detect-node": {
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@@ -2182,6 +2210,7 @@
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+      "optional": true,
       "requires": {
         "webidl-conversions": "^5.0.0"
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@@ -2189,7 +2218,8 @@
         "webidl-conversions": {
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           "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-5.0.0.tgz",
-          "integrity": "sha512-VlZwKPCkYKxQgeSbH5EyngOmRp7Ww7I9rQLERETtf5ofd9pGeswWiOtogpEO850jziPRarreGxn5QIiTqpb2wA=="
+          "integrity": "sha512-VlZwKPCkYKxQgeSbH5EyngOmRp7Ww7I9rQLERETtf5ofd9pGeswWiOtogpEO850jziPRarreGxn5QIiTqpb2wA==",
+          "optional": true
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@@ -2209,6 +2239,7 @@
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
       "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
+      "optional": true,
       "requires": {
         "jsbn": "~0.1.0",
         "safer-buffer": "^2.1.0"
@@ -2363,6 +2394,7 @@
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+      "optional": true,
       "requires": {
         "esprima": "^4.0.1",
         "estraverse": "^4.2.0",
@@ -2375,6 +2407,7 @@
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           "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
           "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
+          "optional": true,
           "requires": {
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             "type-check": "~0.3.2"
@@ -2384,6 +2417,7 @@
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+          "optional": true,
           "requires": {
             "deep-is": "~0.1.3",
             "fast-levenshtein": "~2.0.6",
@@ -2396,7 +2430,8 @@
         "prelude-ls": {
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           "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-          "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
+          "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
+          "optional": true
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         "source-map": {
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@@ -2408,6 +2443,7 @@
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           "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+          "optional": true,
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@@ -2951,7 +2987,8 @@
     "extend": {
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       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
-      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g=="
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
+      "optional": true
     },
     "extend-shallow": {
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@@ -3053,7 +3090,8 @@
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       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
-      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU="
+      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
+      "optional": true
     },
     "fast-deep-equal": {
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@@ -3300,12 +3338,14 @@
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       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
-      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE="
+      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=",
+      "optional": true
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     "form-data": {
       "version": "2.3.3",
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+      "optional": true,
       "requires": {
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@@ -3347,6 +3387,7 @@
       "version": "1.2.7",
       "resolved": "https://registry.npm.taobao.org/fs-minipass/download/fs-minipass-1.2.7.tgz",
       "integrity": "sha1-zP+FcIQef+QmVpPaiJNsVa7X98c=",
+      "optional": true,
       "requires": {
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       }
@@ -3391,6 +3432,7 @@
       "version": "2.7.4",
       "resolved": "https://registry.npm.taobao.org/gauge/download/gauge-2.7.4.tgz",
       "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
+      "optional": true,
       "requires": {
         "aproba": "^1.0.3",
         "console-control-strings": "^1.0.0",
@@ -3405,12 +3447,14 @@
         "ansi-regex": {
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           "resolved": "https://registry.npm.taobao.org/ansi-regex/download/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "http://registry.npm.taobao.org/is-fullwidth-code-point/download/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3419,6 +3463,7 @@
           "version": "1.0.2",
           "resolved": "https://registry.npm.taobao.org/string-width/download/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3429,6 +3474,7 @@
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+      "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
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+          "integrity": "sha512-iFtXzngZVXPGgpTlP1rBqsUK82p9tKqsWRPg5L56egiljujJT3vGAYnHANvFxBieXrTFavhzhxW52jnaWV+w2w==",
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-      "integrity": "sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM="
+      "integrity": "sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM=",
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@@ -4834,7 +4897,8 @@
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-      "integrity": "sha1-0Tdj019hPQnsN+uzC6wEacDuj0M="
+      "integrity": "sha1-0Tdj019hPQnsN+uzC6wEacDuj0M=",
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@@ -4857,14 +4921,15 @@
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       "integrity": "sha1-5xN2Ln0+Mv7YAxFc+T4EvKn8yaY=",
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@@ -4874,6 +4939,7 @@
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       "integrity": "sha1-IpDeloGKNMKVUcio0wEha9Zahh0=",
+      "optional": true,
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@@ -4969,7 +5035,8 @@
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-      "integrity": "sha1-174036MQW5FJTDFHCJMV7/iHSwE="
+      "integrity": "sha1-174036MQW5FJTDFHCJMV7/iHSwE=",
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@@ -5000,6 +5067,7 @@
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       "integrity": "sha1-5vxLPMbCXK7XVUvWE6XPC6yMMcA=",
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@@ -5010,6 +5078,7 @@
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@@ -5083,6 +5152,7 @@
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       "integrity": "sha1-2x8zIVJy9pLNOPAyOOPptHxd0FQ=",
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@@ -5099,7 +5169,8 @@
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-          "integrity": "sha1-qVT5Ma66UI0we78Gnv8MAclhFvc="
+          "integrity": "sha1-qVT5Ma66UI0we78Gnv8MAclhFvc=",
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       "integrity": "sha1-o3XK2dAv2SEnjZVMIlTVqlfhXkg=",
+      "optional": true,
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@@ -5142,6 +5214,7 @@
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       "integrity": "sha1-Ht1XCGWpTNsbyCIHdeKUZsn7I0s=",
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@@ -5149,12 +5222,14 @@
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-      "integrity": "sha1-bnmkHyP9I1wGIyGCKNp9nCO49uI="
+      "integrity": "sha1-bnmkHyP9I1wGIyGCKNp9nCO49uI=",
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+      "optional": true,
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@@ -5182,6 +5257,7 @@
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       "integrity": "sha1-CKfyqL9zRgR3mp76StXMcXq7lUs=",
+      "optional": true,
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@@ -5192,17 +5268,20 @@
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-      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
+      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
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+      "integrity": "sha512-h2AatdwYH+JHiZpv7pt/gSX1XoRGb7L/qSIeuqA6GwYoF9w1vP1cw42TO0aI2pNyshRK5893hNSl+1//vHK7hQ==",
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@@ -5406,7 +5485,8 @@
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-      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M="
+      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
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@@ -5428,6 +5508,7 @@
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       "integrity": "sha1-hc36+uso6Gd/QW4odZK18/SepBA=",
+      "optional": true,
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@@ -5548,7 +5629,8 @@
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@@ -5634,7 +5716,8 @@
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+      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
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@@ -5760,7 +5843,8 @@
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@@ -5895,6 +5979,7 @@
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       "integrity": "sha1-zZJL9SAKB1uDwYjNa54hG3/A0+0=",
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@@ -5905,7 +5990,8 @@
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-          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
+          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
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@@ -6040,12 +6127,14 @@
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@@ -8348,6 +8464,7 @@
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@@ -8445,12 +8562,14 @@
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