[plt-scheme] Integer-length

From: Jim Blandy (jimb at red-bean.com)
Date: Wed Mar 22 14:32:33 EST 2006

What's frustrating here is that, for bignums, the system has an
approximation to the log base 2--- the length of the number in memory
--- right there, but it won't give it to you.  So you should be able
to get it in constant time.

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