[phobos] Simplify iota for floating-point types?

[Andrei Alexandrescu]

Per the recent discussion comparing D with Lua, tests suggest that iota 
for double is too slow. This is a necessity if iota is a bidirectional 
or random-access range. If we allow it to be a forward range, then 
performance would be significantly increased.

Do you agree with making iota for floating-point types a forward range?

Andrei
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