Changes from v5.5.2

draft-07 support:

• if/then/else keywords
• $comment keyword
• default meta-schema is draft-07

Schema IDs

• only $id keyword is used as schema ID by default.
• schemaId option should be set to "id" or "auto" for id keyword to be used.
  See Options.

Formats

• date, date-time, time: support leap year and leap second
• json-pointer: only validates a string format of JSON pointer
• json-pointer-uri-fragment: to validate uri-fragment format of JSON pointer

Keyword changes

• Improved algorithm for uniqueItems keyword to validate an array of same-type scalars in one pass
• Keywords uniqueItems and contains are validated after items and type coercion (with coerceTypes option)
• Additional error parameters for oneOf keyword
• Removed deprecated patternGroups keyword
• Reserved annotation keywords: examples, readOnly, writeOnly, contentEncoding, contentMediaType.

Other

• Defaults are now assigned inside schemas of then/else keywords.
• Option $comment to log/pass to a function strings from $comment keyword.
• Async schemas can only be compiled to async functions, compilation to generator functions is no longer supported.
• Documented convention for plugins.
• Removed v5 meta-schema.
• Removed nodent bundle, ajv-async bundle includes nodent now.