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The NFC recomposition incorrectly included TBASE as a valid T syllable, which is incorrect based on the Unicode specification (TBASE is one below the start of the range, range beginning at U+11A8). This would cause the TBASE to be silently swallowed in the normalization, leading to an incorrect result. A couple of regression tests are added to check more patterns with Hangul recomposition and decomposition, on top of a test to check the problem with TBASE. Diego has submitted the code fix, and I have written the tests. Author: Diego Frias <mail@dzfrias.dev> Co-authored-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/B92ED640-7D4A-4505-B09F-3548F58CBB16@dzfrias.dev Backpatch-through: 14