(@ (rnrs base) log) optional second argument

[Ian Price]

Hello guilers,

Guile does not implement the optional second argument for log. I have
attached a simple patch that implements it using the formula you learn
in high school.

I have left the behaviour for two special cases alone, as there is no
clear right answer among the current R6RS implementations. If you have
strong opinions on this behaviour, feel free to write something better.

Regards,
Ian

0001-Added-optional-second-arg-to-R6RS-log-function.patch
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