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A `start` or `end` such as -1 or 1.5 was read as absent and changed text before the range; it is now refused. Characters that already have the value are left out, so a run that changes nothing returns count 0 and makes no undo step. docs/mcp.md cites the public formatting-type page. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>