Make a utility to generate paths for record fields that use optimized access

[nathanmarz]

e.g.

(defrecord Foo [a b])
(define-record-field-paths Foo)

This would generate paths Foo-a-path and Foo-b-path. The select code path would use direct field access rather than do a keyword lookup to achieve a performance improvement.

[aengelberg]

Since paths can now be compiled in-line, I would suggest instead writing a macro that can be used in-line for a specific field of a record. e.g.

(select [ALL (record-nav Foo a)] [(->Foo 1 2)])
=> [1]