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`json`: restore default additionalProperties to false, fix some pattern escapes (#8180)

* json: expand ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS charset

* json: revert default of additionalProperties to false

* Update README.md
O
Olivier Chafik committed
139cc621e90b4f61830515c3c124cf35b3d7a6dc
Parent: e57dc62
Committed by GitHub <noreply@github.com> on 6/28/2024, 8:26:45 AM