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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Remove constants=None; explicit None raises with migration hint","articleBody":"Completes #260 (which ships `Constants.copy()` and the `DeprecationWarning` in 1.4). In 2.0, explicit `constants=None` raises `TypeError` naming both replacements:\n\n- `constants=Constants()` for fresh library defaults\n- `constants=CONSTANTS.copy()` for a private snapshot of current shared config\n\nIt must *raise*, never be reinterpreted — silently flipping `None` to mean \"shared\" would invisibly change behavior for every existing caller.\n\n## Checklist\n\n- [ ] Explicit `None` raises `TypeError` with the migration hint\n- [ ] Remove the `None`-constructs-`Constants()` branch from `__init__`; annotation narrows to `constants: Constants = CONSTANTS`\n- [ ] Update customize.rst mentions and the migration section\n","author":{"url":"https://github.com/derek73","@type":"Person","name":"derek73"},"datePublished":"2026-07-06T08:14:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/261/python-nameparser/issues/261"}