I am accessing a Boolean field on a JavaScript object and if the host is 64-bit
JavaScriptCore I will get back either a true or false ClojureScript value. If
it is instead a 32-bit JavaScriptCore host, I will get back either a 0 or 1
ClojureScript value.
The context of all of this is JavaScriptCore embedded in an iOS app, but I'm
hoping that perhaps someone with ClojureScript driving Safari may have
encountered this. Alternatively, perhaps I've uncovered a bug somewhere in the
stack.
More specifics of the environment where I'm encountering this:
The JavaScript object is actually an Objective-C object injected into the
JavaScriptCore execution context, where the Objective-C object has an exported
BOOL property:
@protocol MyObject <JSExport>
@property BOOL foo;
@end
@interface MyObject : NSObject<MyObject>
...
@end
I access this property's value using the (.-foo my-object) syntax, and if I
print the value in the REPL I will see true or false if the iOS app is running
on a 64-bit device or in the 64-bit simulator, and I will see 0 or 1 if the iOS
app is running on a 32-bit device or in the 32-bit simulator.
Trying to dig deeper, I can see the following when in the 64-bit host:
(type (.-foo my-object))
#<function Boolean() {
[native code]
}>
=> nil
and the following when in the 32-bit host:
(type (.-foo my-object))
#<function Number() {
[native code]
}>
=> nil
Of course, without fixing the underlying issue, I must handle the return values
specially, as 0 is not falsey.
My hope is that someone will say, "Ahh yeah, we've seen that with 32-bit
Safari, and here's what we did to handle it." Otherwise, I'm gonna dig deeper.
Thanks!
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