In #3427 I noted that NFToken flags don't use the lsf prefix in the source code, since they're not Flags in an actual ledger object: NFT flags are incorporated into the NFTokenID instead, and they use the prefix flag instead (for example, flagBurnable not lsfBurnable).

The documentation consistently refers to all NFT flags with the lsf prefix, but ideally the naming would line up with the naming scheme used in the source code.