Validation for various kinds of git related items.
Errors expose a classification-only [gix_error::ClassificationMarker] source.
Use [gix_error::classify()] or is_validation() on [gix_error::Exn] and [gix_error::Error] to check the
classification, without depending on the concrete diagnostic type. The concrete validation
error remains available for downcasting and probable-cause selection.
Examples
use ByteSlice;
assert!;
assert!;
assert!;
assert!;
assert!;