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"""Commit identifiers share Java long and Rust i64's signed integer domain."""

import operator


def validate_commit_identifier(value):
    """Normalize Python integer-like values before preparing or publishing files."""
    identifier = operator.index(value)
    if not -(1 << 63) <= identifier < (1 << 63):
        raise OverflowError('commit_identifier must fit in a signed 64-bit integer')
    return identifier