This is due to how Nim handles literals. The followimg exhibits the same
behaviour.
proc doThing(i: float) = discard
proc doThing(i: float32) = discard
doThing 10
Run
Yes `typeof(10)` is `int` but not all int literals are `int`, context changes
their type. Consider `var a: byte = 255` or `var a: float = 3` the compiler
implicitly converts to the type. In the case of an overloaded call like this it
does not know to convert to the generic 8bit ints or the generic remainder. To
a point if we do `echoI int(56)` it calls the expected procedure and runs.
