Hp50g emu : graph abs(x)^3 gives negative y-values

[Gil]

Anyway, for my instinctive, poor knowledge, it's not clear
why when - 119 flag is set to "rigorous off"

y=ABS(X) gives, in the stack, "correctly" +5 when X is equal to -5,
whereas it is drawn like X = -5, or

y=ABS(X)^3 gives, in the stack, "correctly" +125 when X is equal to -5,
whereas it is drawn for a y-value = X^3 = -125.

I do not see the point of having that flag
with two different behaviours according to the context :

- stack, programs —> absolute value taken into account ;
- graphics —> absolute not taken into account.

I wish I could use the existing flag in a concrete, useful case.

Gil