It should't try to shim what is not possible

[rosenfeld]

I'm getting this exception when using Serenade.js together with es5-shim:

https://github.com/kriskowal/es5-shim/blob/master/es5-shim.js#L691

Serenade.js will only use defineProperty if it is defined, but es5-shim will define it and throw an exception when used, so what is this useful for?

[kriskowal]

I will accept a well-reviewed pull request that strategically separates dubious and aesthetic shims into separate files so they can be mixed and matched.

defineProperty is a tricky one since it can be partially shimmed in many engines and whether you should try depends on which engines you intend to support.

[kriskowal]

I’ve separated the shams into es5-sham.js