See https://twitter.com/travisci/status/880550780368855040

I have no idea why this test has been removed in the first place.

When an empty vector was passed to the parse function, an empty iterator range was used to construct an input iterator. Unfortunately, we then cannot use the start iterator to derive a pointer from.

Found with Xcode's undefined behavior sanitizer.

Removed deprecated documentation of the comparison operator.

fix typo in operator__notequal example

Fix MSVC warning C4819

Travis aborts tests if they do not produce output for 10 minutes. This commit shall fix this.

Replace unicode whitespaces by ASCII whitespace 0x20

add pair/tuple conversions

[BugFix] Add parentheses around std::min