[Feature Request] - Allow add required modifier ! to non-null base property in specification

[bingo084]

Reason

In the specification, all properties are nullable by default.

However, sometimes non-null properties are needed and can be explicitly marked as non-nullable using !.

If a property is already non-null, attempting to use ! will cause a compilation error:

Illegal required modifier '!' because the base property is already nonnull

Description

Allow add required modifier ! to non-null base property in specification.

Existing solutions

No response

[babyfish-ct]

Try 0.9.71