fix: converter should transform stringio into string where applicable (#228)

Author: stainless-app[bot]

lib/orb.rb

@@ -39,7 +39,7 @@
 require_relative "orb/internal/util"
 require_relative "orb/internal/type/converter"
 require_relative "orb/internal/type/unknown"
-require_relative "orb/internal/type/boolean_model"
+require_relative "orb/internal/type/boolean"
 require_relative "orb/internal/type/enum"
 require_relative "orb/internal/type/union"
 require_relative "orb/internal/type/array_of"

lib/orb/internal/type/boolean_model.rb lib/orb/internal/type/boolean.rblib/orb/internal/type/boolean_model.rb renamed to lib/orb/internal/type/boolean.rb

@@ -168,6 +168,9 @@ def coerce(
                 in String | Symbol | Numeric
                   exactness[value.is_a?(Numeric) ? :maybe : :yes] += 1
                   return value.to_s
+                in StringIO
+                  exactness[:yes] += 1
+                  return value.string
                 else
                   if strictness == :strong
                     message = "no implicit conversion of #{value.class} into #{target.inspect}"