Enum matching improvement

[Stranger6667]

If all items in the enum are of the same type, then we can build a special validator for this type, in this case, we can speed up validation because for not matching types we won't need comparisons at all and for matching types, we'll have some improvement as well - we can store unwrapped values, unwrap the input value once during the matching step and then compare them in a loop, which should be faster.

{"enum": [1, 2, 3, 4, 5]}

If the input instance is "foo", then we don't need to iterate over all variants, we can return false immediately. The trick will work only for homogenous arrays