Add unique identifier to typeclass symbol names (#56)

* Add unique identifier to typeclass symbol names

This adds a unique tag to the typeclass symbol names because sometimes
build systems will mangle the class names.

What was happening was that `Functor` and `Filterable` were unique
within their own scopse, so the class name became “e”. That caused
funcadelic to look up the instance for `Functor` and getting
`Filterable` because they both had `"@@funcadelic-0/e"` as their
symbol name

* Check to see if function names are being altered

If they are being altered then we add the uniqueTag to the typeclass
symbol name

* Use Unique Tag for typclass symbol names if mangled

src/typeclasses.js

@@ -7,9 +7,16 @@ invariant("name" in Function.prototype && "name" in (function x() {}), `funcadel
 
 const VERSION = 0;
 
+// A function that exists to check if the compiler is crushing
+// function names. If it is we need to use `uniqueTag` to make sure
+// there's no collisions when looking up `symbolNames`
+function isCrushed() {}
+let hasBeenMangled = typeof isCrushed.name === 'string' && isCrushed.name !== 'isCrushed';
+let uniqueTag = 0;
+
 export function type(Class) {
 
-  let name = Class.name;
+  let name = hasBeenMangled ? uniqueTag++ : Class.name;
 
   if (!name) {
     throw new Error('invalid typeclass name: ' + name);