Big Sur test (zsh)

[polluks]

###### Unit Test #####
ok 1
ok 2
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not ok 6
#   Failed test in ./tap-functions:is() at line 285.
#          got: 'error: option `-i` Invalid argument'
#     expected: 'error: option `-i` expects an integer value'
not ok 7
#   Failed test in ./tap-functions:is() at line 285.
#          got: 'error: option `-i` Result too large'
#     expected: 'error: option `-i` Numerical result out of range'
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ok 9
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not ok 11
#   Failed test in ./tap-functions:is() at line 285.
#          got: 'error: option `-s` Result too large'
#     expected: 'error: option `-s` Numerical result out of range'
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1..17
# Looks like you failed 3 tests of 17.
make: *** [test] Error 3

[cofyc]

Thanks for the reporting!