This function returns 1 if <object> has all the flags in a specified list, and 0 if it does not. The list is specified with a single letter standing for each flag, like the output of the FLAGS() function. A '!' preceding a flag letter means "not flag".
If a letter does not correspond to any flag, <object> doesn't have it, so the function returns 0. There can be an arbitrary number of flags. Do not put spaces between flag letters.