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String expectation with min(0) and a nullable flag does not accept null #23

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@finwe

Description

@finwe

Version: 1.0.2

Bug Description

String expectation with min(0) and a nullable flag does not accept null.

Steps To Reproduce

Expectation is defined as

$schema = Expect::structure([
    'position' => Expect::string()->min(0)->nullable(),
]);

When validating with ['position' => null], the error message raised is

"The option 'position' expects to be string or null in range 0.., null given."

Expected Behavior

The null value should be accepted according to the error message.

If failing for other reasons, null should be mentioned first in the error message for it to make more sense (only strings have "ranges")

Possible Solution

Nullable does not take precedence over string length constraint even when minimal string length is 0

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