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Adds the given validator, and maps to the given higher-level type U.

Unlike a .validate(v).map(f)(g) invocation, during decoding the validator is run before applying the f function. If there are validation errors, decoding fails. However, the validator is then invoked again on the fully decoded value.

This is useful to create inputs/outputs for types, which are unrepresentable unless the validator's condition is met, e.g. due to preconditions in the constructor.

Adds a validator.

Note that validation is run on a fully decoded value. That is, during decoding, first the decoding functions are run, followed by validations. Hence any functions provided in subsequent .maps or .mapDecodes will be invoked before validation.

Adds a validator which validates each element in the collection.

Should only be used if the schema hasn't been created by .mapping another one, but directly from Schema[U]. Otherwise the shape of the schema doesn't correspond to the type T, but to some lower-level representation of the type. This might cause invalid results at run-time.

Adds a validator which validates the option's element, if it is present.

Should only be used if the schema hasn't been created by .mapping another one, but directly from Schema[U]. Otherwise the shape of the schema doesn't correspond to the type T, but to some lower-level representation of the type. This might cause invalid results at run-time.