Support strings coercion in scope

[am-kantox]

iex(1)> Abacus.eval "a>5", %{"a" => 4.5}
{:ok, false}
iex(2)> Abacus.eval "a>5", %{"a" => "4.5"}
{:ok, true}

Of course, I can do a coercion to respective Float before evaling, but people expect this to be done by abacus :)

I believe, the coercion might be easily done here. Please confirm, and I will provide the pull request. Thanks in advance.

[narrowtux]

I'm not sure if that would be in scope of the library, it feels like fuzzy behaviour to me.

Also, this can bite me if I decide to implement some string support later.

[am-kantox]

Fair enough. Please don’t hesitate to close this issue, you’re absolutely right, this is out of scope.

Sorry for bringing this out.

[narrowtux]

Don't feel bad about it :)