ndslice: allow: a[ _, 9, R(2, $, -3)] as matlab's a[: ,9, reverse(2:3:end)) ]

[Timothee Cour via Digitalmars-d]

i wrote my own tensor library a while ago and it allows the more convenient
matlab/python+numpy like syntax:

a[ _, 9, R(2, $, -3)]
these are allowed:
R() or _: full range for an index
R(a,b): a..b
R(a,b,s): when s>0, iota(a,b,s)
R(a,b,s): when s<0, iota(a,b,-s).reverse

Could we have this in ndslice?
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