subdivision-flag doesn't split well

[sangar82]

Thanks for this excellent package!

I've found some new emojis doesn't split well
https://unicode.org/emoji/charts/full-emoji-list.html#subdivision-flag
Example: wales flags splits to: (7) ["🏴", "󠁧", "󠁢", "󠁷", "󠁬", "󠁳", "󠁿"]

[zedryas]

Hello,

While looking at those new regional flags I've noticed they follow this sequence:
0x1F3F4 // Black Flag
0xE0067 // Tag Latin Small Letter G
0xE0062 // Tag Latin Small Letter B
...3 specifics to the flag itself
0xE0007 // Cancel Tag

So they use 7 astral codes and string need to be advance by 14

Hope that helps