Translate byte[].Contains with a non-constant byte to a one-byte BLOB…

[ilkertskn]

… on SQLite

SqliteByteArrayMethodTranslator translated bytes.Contains(b) with a parameter or column argument to instr(bytes, char(b)). char() returns TEXT containing the UTF-8 encoding of the code point, which makes instr compare as text rather than as bytes, so every value above 0x7F was wrong in both directions: instr(X'DEADBEEF', char(222)) returns 0 (missed match), while instr(X'01C38802', char(200)) returns 2 (false match on the UTF-8 bytes of U+00C8). The constant path already built a proper BLOB literal.

Build the search value as unhex(printf('%02X', b)) instead, which yields a one-byte BLOB and makes instr compare bytes, and add a test with a byte above the ASCII range.

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