fix calculation of pad bits length while decoding - #18
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Current implementation returns incorrect pad bits length when the base32 encoded string has a redundant character.
Specifically, in cases base32 encoded string's length is 3 (15bits) or 6 (30bits).
(I know these length of strings are not properly encoded, though)
base32/lib/base32.rb
Line 20 in 5b86e54