[cpp] Explicitly cast float strings.  Closes #2174.
[cpp] Explicitly cast float strings.  Closes #2174.

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe