Fix return type annotation on identical() (lstrojny#179)

Fix wrong return type for invoke_first/last (lstrojny#155)

Make test more robust

Fix typo

Require PHP 7

Higher order function to convert PHP errors to exceptions / suppress …

…errors (lstrojny#111)

Preserve indexes in Functional\zip()

Remove callable typehint from compose() (lstrojny#98)

This is due to lack of support in HHVM.

See facebook/hhvm#6954

lstrojny#95: deprecate invocation of (lstrojny#96)

Adding capture()