Fix JavaScript number tokenization - #1314
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Fixes #789
Prevent JavaScript identifier rules from matching tokens that start with a digit, allowing decimal, fractional, and exponent literals to reach the number rule. The number rule now checks hexadecimal literals before the shorter
0alternative so their full token is preserved.Adds focused regression coverage for all four supported number forms.
Tests:
python -m pytest -q— 7736 passed, 7 skipped, 2 xfailedpre-commit run --files babel/messages/jslexer.py tests/messages/test_jslexer.pypython -m compileall -q babel/messages/jslexer.py tests/messages/test_jslexer.py