[oden-js] Fix cross-platform conversions

Lots of places were assuming that bool and c int were interchangeable,
but of course on windows a c int is 32 bits and that confused
everybody. Tighten up the definitions in static-functions, which
causes us to fix boolean conversion. Also add tests for boolean
conversion, and also add better debug formatting of JS values.

oden-js/src/context.rs

@@ -182,7 +182,8 @@ impl ContextRef {
     where
         T: Into<bool>,
     {
-        self.check_exception(unsafe { sys::JS_NewBool(self.ctx, value.into()) })
+        let b = if value.into() { 1 } else { 0 };
+        self.check_exception(unsafe { sys::JS_NewBool(self.ctx, b) })
     }
 
     /// Construct a new value that wraps a strongly-typed closure.