classify: change S.is to take a sanctuary-def Type value

sanctuary-js / sanctuary

:see_no_evil: Refuge from unsafe JavaScript

https://sanctuary.js.org

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classify: change S.is to take a sanctuary-def Type value #513

Closed davidchambers closed 6 years ago

davidchambers commented 6 years ago

Closes #502

This pull request greatly increases the expressive power of S.is by allowing us to specify types such as Array (Maybe Integer) rather than Array ???.

If this pull request is accepted, #481 will no longer be warranted.

/cc @futpib, @gautaz, @miwillhite, @najlachamseddine, @tomkel