I noticed that cljs.core redefines String.prototype.apply. Being new to 
Clojure, I don't understand what this redefinition does or what it is for. 
But I do know that redefining functions in the JS standard library, or 
defining new ones on standard objects, is something that should be done 
with great care, to avoid breaking other pieces of JavaScript running in 
the same context (e.g. on the same page). (And lest you think your 
JavaScript is sure to be the only JavaScript on your page, bear in mind 
that some browsers make web pages accessible to blind users by injecting 
their own JS into the page.) 

I know there are always trade-offs. And perhaps this definition of 
String.prototype.apply is known not to conflict with any other JavaScript 
code. But I would appreciate an explanation of what purpose it serves. 

Thanks, 
Matt 

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