Fix regexp keyword (#220, incorrect caching of RegExp with flags)
Take Ajv option unicodeRegExp into account with regexp and patternRequiredkeywords
Don't mutate a schema with a transform keyword (#173, @n-e)

Upgrade for Ajv v8
Deprecate keyword select - OpenAPI discriminator should be used instead.

Fix select keyword with non-string values (#150)

Update ajv and ajv-formats versions
Import fast-deep-equal directly

Upgrade ajv v8

All keywords support Ajv v7.
Keywords formatMinimum/formatMaximum and formatExclusiveMinimum/formatExclusiveMaximum moved to ajv-formats, the latter two were changed to be used independently for exclusive boundaries, not as modifiers.
Keyword exclusiveRange was changed to be used separately, not as a modifier.
Keywords select/selectCases/selectDefault are re-implemented using new Acv v7 api for keywords - they now support relative references in subschemas.
Support for unevaluatedProperties/unevaluatedItems with select keyword
Use "latest" metaschema URI "http://json-schema.org/schema" for compatibility with Ajv export for JSON Schema draft-2019-09.
New implementation for "transform" keyword.
Supports standalone validation code
Keyword error type to extend tagged union DefinedError supplied by Ajv

Define keyword error types, to simplify extending type DefineError in ajv

Improve support for standalone validation code

Use "latest" metaschema URI "http://json-schema.org/schema" for compatibility with Ajv export for JSON Schema draft-2019-09.
New implementation for "transform" keyword.

Support unevaluatedProperties/unevaluatedItems with select