The cli/tac@0.1.0 candidate reverses records from standard input or one file and writesthe result byte-for-byte. The default separator is newline. -s STRING uses afixed UTF-8 separator and -b places separators before records.
The -r/--regex mode is explicitly rejected. Released public MoonBit APIsdo not provide the required byte-oriented regular-expression contract, so thecommand does not pretend to support GNU regular separators. Multiple inputfiles are also rejected in this first implementation.
The support record in docs/compatibility.md separates local Native/Wasmverification from published MoonX behavior.