Enforce return type hints on all functions and require PHP 7.1+ as a consequence #149
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With #138 requiring PHP 7.0 as a minimum we can now add return type
hints to all our public and private functions. To give all functions
return type hints we need the
void
return type, which isn't availableuntil PHP 7.1. So in order use that we also have to bump the the
minimum required PHP version for this package to PHP 7.1.
The benefit of return type hints is the assurance at language level
of our return values. For ourself and our consumers.