newRPL: Angles revisited

[Claudio L.]

(04-01-2016 06:20 PM)Nigel (UK) Wrote:  ...
In degrees mode your suggested logic respects this - 91D and 91 are the same quantity, so far as trig functions are concerned. So long as the same is true in radian mode, I'll be content.

Only one final observation: The reason to assume the quantity is in the same system as the angle in the stack is two-fold:
a) So that an angle is also just a number (the only reason to have this new way to input angles instead of using units is because angular units cannot be made consistent with non-dimensional quantities and yet preserve its unit designation). Unless we know for sure a number is an angle, let's not assume that on behalf of the user. When there's ambiguity, they behave like raw numbers.
b) To make results independent of system-wide flags. I always want to remove system-wide flag dependency if possible. In this case is not possible nor desirable to eliminate the system-wide angular system. However, a program << ∡90° 1 +>> should produce always the same result regardless of flags state.