[perl #70105] [PATCH] Optional $base argument for log()

[Kodi Arfer]

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This is a simplistic implementation of the optional $base argument to
the various functions and methods named log(). It computes the logarithm
of an arbitrary base as the quotient of two natural logs. With these
additions, Rakudo can pass tests 3 and 4 in t/spec/S32-num/log.t.