# SPDX-FileCopyrightText: © 2026 Jeffrey C. Ollie <jeff@ocjtech.us>
# SPDX-License-Identifier: MIT

"""String handling shared by the index writer and the normalizer."""


def fold_case(value: str) -> str:
    """Unicode default case folding, as winget's `Utility::FoldCase` does with ICU.

    `str.casefold` is the same full default folding (ß becomes ss, and so on)
    that `ucasemap_utf8FoldCase` performs with `U_FOLD_CASE_DEFAULT`.
    """
    return value.casefold()