divide
Divide the Avail integer argument by the receiver, destroying one or the other if it's mutable and canDestroy is true. Because of the requirement that the argument be an integer rather than an arbitrary A_Number, this is usually only used for double-dispatching.
Return
The quotient, possibly recycling one of the inputs if canDestroy is true.
Parameters
an
The integer to divide by the receiver.
can
Whether a mutable receiver or argument may be destroyed and/or recycled to hold the quotient.