zurb/foundation — pull request #4454 by serquhart (2014-02-16 00:23:31+00:00)
Title: Button radius default true

The docs show button radius as being true by default, and the comments in _settings indicate that $global-radius and $button-radius are used throughout the core by default. I think the docs have it best - if there's a global radius set, it should be applied to buttons by default.