docs: recommend string identifiers for numeric codes#170
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- add warning callouts about leading-zero numeric literal hazards - stop advertising bare numeric identifier examples in the README - keep runtime behavior unchanged
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Summary
Recommend string identifiers over numeric ISO numeric-3 / UN M49 inputs in the docs.
Why
JavaScript can misparse leading-zero numeric literals like
021,030, or053in non-strict code beforecountry-coderreceives them.Runtime support for numeric identifiers remains unchanged, but the README should stop advertising bare numeric examples as the preferred usage.
Changes