I have two questions that I've come upon lately:

1) How was it decided that there should be implicit conversion between signed and unsigned integers in arithmetic operations, and why prefer unsigned numbers?
E.g. Signed / Unsigned = Unsigned
Is this simply compatibility with C or is there something greater behind this decision.


2) With regard to reducing template instantiations:
I've been using a technique similar to the one mentioned in the video: separating functions out of templates to reduce bloat.
My question is: does a template such as:
T foo(T)(T x)
if (isIntegral!T) { return x; }

Get instantiated multiple times for const, immutable, etc. qualifiers on the input?

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