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PSL uses both compiled and interpreted code. If compiled, a function usually executes faster and is smaller. However, there are some semantic differences of which the user should be aware. For example, some recursive functions are made non-recursive, and certain functions are open-compiled. A call to an open-compiled function is replaced, on compilation, by a series of online instructions instead of just being a reference to another function. Functions compiled open may not do as much type checking.
To avoid this the user would have to add code which checks the type of P before car is applied.
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