Normalizes a byte-backed input source into in-memory bytes plus best-effort metadata.
This helper intentionally does not accept remote URLs as a supported source
form. Providers that support remote fetch-by-URL should branch on that before
calling this helper.
Normalizes a byte-backed input source into in-memory bytes plus best-effort metadata.
This helper intentionally does not accept remote URLs as a supported source form. Providers that support remote fetch-by-URL should branch on that before calling this helper.