[sunxiuguo]

Summary

Follow up on #1402 by keeping star width/precision arguments distinct from decimal conversions during Python-format compatibility checks. The original argument-count fix remains intact.

%d, %i, and %u accept floating-point values, whereas * requires integers. On current master (9a3ef477), this incompatible translation is accepted:

args = (3.5, "word")
"%d%s" % args  # "3word"
"%*s" % args   # TypeError: * wants int
python_format(None, Message("%d%s", "%*s"))  # no error before this fix

Use a separate * category and retain only the safe direction from a star argument to a decimal conversion. Ordinary conversion compatibility and named-placeholder behavior are unchanged. No new conversion families are made compatible.

Tests

• Against unchanged master: ten new regression cases fail (all three decimal conversions to width/precision, both positions in a double-star format, and plural catalog validation); nineteen selected controls pass.
• After the change: checker tests and module doctests 90 passed.
• Complete suite: 7,943 passed, 7 skipped, 2 xfailed on Linux CPython 3.12.14 with pytest 9.1.1; one existing parametrization deprecation warning.
• CLDR 48.2 downloaded from the repository's configured Unicode URL, verified against its pinned SHA-512, and imported with the current repository script.
• Ruff on both changed files and git diff --check pass.

Prepared with AI assistance, including independent review and actually executed synthetic tests. Hosted CI and other Python/platform combinations have not been run by this contribution; no maintainer approval is asserted.