#571 TaggedScalar.value has an unknown type

[Adam Dangoor]

In ruamel.yaml 0.19.1, strict Pyright cannot determine the type of the public TaggedScalar.value attribute:

from ruamel.yaml.comments import TaggedScalar

def payload(value: TaggedScalar) -> str:
    return value.value

This reports reportUnknownMemberType and reportUnknownVariableType. TaggedScalar.str, count, and getitem also return Any.

Ticket #361 confirms that parser-produced tagged scalar values being strings is deliberate. These attributes and methods can therefore have precise string-based annotations. The constructor currently defaults value to None, so the implementation should also establish a valid string state rather than merely annotating a value that can still be None.

[Adam Dangoor]

Implemented in merge request #17. The change gives TaggedScalar.value and its string-like methods precise types and makes default construction establish a valid string state. The strict Pyright reproducer and full Python 3.9/3.14 test suites pass.