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36c401db24
Closes #16624 Fixes two issues with aligning the start position and end position to codepoints when calculating the start and end range. When aligning the start position: * use aligned byte index to calculate character index rather than the unadjusted byte When aligning the end position: * do not adjust the end byte if it falls on a UTF-8 codepoint * align byte to the first byte of the next codepoint rather than the last byte of the current codepoint * compute character character end range on the aligned byte index This commit also adds additional test coverage, including multibyte operations that previously failed before this commit.