with fot int::range(low,hi) i can loop from low to h1-1 with for int::range_step(low, hi, step) i can loop for low to hi-1 with step "step"
with for int::range_rev(hi, low) i can loop from hi to low, reverse mode but... how can loop from hi to low with step other than 1? range_rev_step is obviously undefined.... thx.
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