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Previously, mbstring used the same logic for encoding validation as for encoding conversion. However, there are cases where we want to use different logic for validation and conversion. For example, if a string ends up with missing input required by the encoding, or if a character is input that is invalid as an encoding but can be converted, the conversion should succeed and the validation should fail. To achieve this, a function pointer mb_check_fn has been added to struct mbfl_encoding to implement the logic used for validation. Also, added implementation of validation logic for UTF-7, UTF7-IMAP, ISO-2022-JP and JIS.