...It's OK. there are no implicit conversions of FP--> integer in the language I...

...that this is legal.  Why allow implicit conversions when assigning to a reference?

In C...

...however do this check *after* any implicit conversions to the return type. So, while my...

...is in the mix, yes. It's conversions and escapes that spoil things. We disallow...

...There are 3 cases of such implicit conversions:

1. built-in numerics, e.g. an...

...the user. C++ is full of implicit conversions, so these types of silent bugs crop...

...t be pretty.

And what about implicit conversions to const(char)[]? That too will require...

...suggested an alternative way of handling implicit
  conversions, which I think is better, but I...

...s not a dependency on toString or conversions to string of any kind in toHash...

...then the lack of purity for string conversions does become a serious issue which must...