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is-approx-calculate
Combined from primary sources listed below.

In module Test§

See primary documentation in context for sub is-approx-calculate. 

sub is-approx-calculate($got, $expected, $abs-tol where { !.defined or $_ >= 0 },
                        $rel-tol where { !.defined or $_ >= 0 }, $desc)

This is the actual routine called by is-approx when absolute and relative tolerance are specified. They are tested independently, and the test succeeds only if both pass.