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FormatCheckeraz
A ``format`` property checker.
JSON Schema does not mandate that the ``format`` property actually do any
validation. If validation is desired however, instances of this class can
be hooked into validators to enable format validation.
`FormatChecker` objects always return ``True`` when asked about
formats that they do not know how to validate.
To add a check for a custom format use the `FormatChecker.checks`
decorator.
Arguments:
formats:
The known formats to validate. This argument can be used to
limit which formats will be used during validation.
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