B::Keywords supplies several arrays of exportable keywords: @Scalars, @Arrays,
@Hashes, @Filehandles, @Symbols, @Functions, @Barewords, @TieIOMethods,
@UNIVERSALMethods and @ExporterSymbols.
The @Symbols array includes the contents of each of @Scalars, @Arrays, @Hashes,
@Functions and @Filehandles.
Similarly, @Barewords adds a few non-function keywords and operators to the
@Functions array.
