Add an Alternate combinator.

[logaan]

Will allow a value if either valiator passes. As created by @dpom here.

[logaan]

This could make rendering error messages difficult. Say you want something like "Age must be greater than or equal to 21". If you create the validation by combining equal-to and greater-than then only the error for greater than will be shown (if implemented as seen here).

[logaan]

Possibly by having errors return in a tree structure that mimics the structure of the validations we could have an error that looks like {:type :alternate :children [{...} {...}]} and then we'll have all the information need to render an error like "Must be [greater than 10] or [equal to 10]". Which is still somewhat awkwardly worded. Perhaps having a :message field on Alternate would help as well.