Is scrub_fields officially intended to support partial matches?

[mtoneil]

scrub_fields are treated as partial matches due to the scrubbing implementation that builds a regex like /first|second/i. However the SDK documentation and the README don't make that clear. Even the default values for scrub_fields imply the opposite, e.g. it contains :password, :password_confirmation, and :confirm_password, even though the :password entry covers all three. Same goes for :secret and :secret_token.

Personally I like the partial matching because it is safer. But before I rely on this behavior, I want to be sure that it is officially supported and won't change in the future to full string matching.