Inconsistent function names #68
Description
From @rpruim: Many of the functions in the package are named foo_bar(). Sometimes foo indicates what type of object is returned (f_capture() returns a formula) and sometimes foo indicates what sort of thing must be the input (f_eval() operates on a formula). That seems a little bit confusing. If expr here is supposed to indicate that the first argument is a promise, perhaps f_capture() should be expr_capture(), or perhaps all of these should be p_* (p for promise).