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A Unicode grapheme-handling edge case in Ruby's interactive line editor caused pressing backspace when the cursor was after an emoji to corrupt internal state and crash the REPL. The root cause involved mixing byte-oriented and character-aware operations when deleting user input, which failed for multi-byte emoji sequences. The fix updated input-deletion logic to operate on grapheme clusters, added regression tests for emoji and other multi-codepoint characters, and hardened the editor's validation. The change was accepted into Ruby's codebase, demonstrating that small, well-scoped fixes to core tools are achievable by contributors.
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