utils/String `fromUint256` should probably be `toString`

[Arachnid]

Supposing we use the common convention of using such utility functions as a library:

contract Foo {
  using Strings for uint256;

  function test() returns(string memory) {
    uint i = 42;
    return i.fromUint256();
  }
}

The function name here tells us nothing - we already knew it was a uint256 from the variable type. toString would be a much more intuitive name, and line up with what other languages use in the same situation.

[nventuro]

I think the issue is Strings wasn't meant to be used that way, but rather as Strings.fromUint256(), so that we could also have Strings.fromInt256() and friends.

Granted the plural form on Strings looks strange though, and no other library is used this way - we may want to revise this. Thanks!

[frangio]

Both Strings.toString(x) and x.toString() look nice IMO. And there can be overloads for different types.