needs tests/harness num/crc
testbegin
\test crc[]
"thisisatest" c@+ crc32[] $fba2fc21 #eq
"thisisatest" c@+ crc16[] $9228 #eq

\test byte-by-byte
crc32$ 'A' acccrc 'B' acccrc 'C' acccrc crcdone $a3830348 #eq

testend