'int' is enough for 'length' to migrate code from x86 to x64

[Kagamin via Digitalmars-d]

On Tuesday, 18 November 2014 at 18:23:52 UTC, Marco Leise wrote:
> Aside from the size factor, I personally prefer unsigned types
> for countable stuff like array lengths. Mixed arithmetics
> decay to unsinged anyways and you don't need checks like
> `assert(idx >= 0)`.

Failing assert(-1 < arr.length) make little sense though, -1 
can't be bigger than a non-negative number.