String validation

[streamich]

Add ability to specify a string format. Introduce utf8 and ascii formats, add validation routines for those formats. ASCII should only allow valid ASCII characters in the string, UTF-8 should only allow valid UTF-8 strings (you are coding in JavaScript, which uses UTF-16 strings). Make sure implementation is very very performant.

• Introduce string sub-formats as part of the format property in string nodes.
  • utf8
  • ascii

[github-actions]

🎉 This issue has been resolved in version 1.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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