Summary:
Pull Request resolved: https://github.com/facebook/duckling/pull/533
In recent versions of Data.Some the name of the constructor, `This` has changed name to `Some`. This has become rather problematic for us to migrate so we're just going to remove the dependency. The meat of this diff is adding the type `Seal` to `Duckling.Types`. That type replaces `Some`.
Reviewed By: pepeiborra
Differential Revision: D23929459
fbshipit-source-id: 8ff4146ecba4f1119a17899961b2d877547f6e4f
Summary:
Add the ability to parse credit cards and identify the issuer in Duckling.
Credit card numbers are a sequence of 8 to 19 digits, with a few specific digits at the start that identify the card issuer. They also satisfy Luhn checksum (https://en.wikipedia.org/wiki/Luhn_algorithm).
Reviewed By: chinmay87
Differential Revision: D13014623
fbshipit-source-id: 96586e074777ae90a4a39c515648c31a8111f0c2
