Base#adapt_source modifies input string in-place

[denisdefreyne]

Kramdown::Parser::Base#adapt_source modifies the encoding of the input string in-place (source). I don’t believe it should; input arguments should not be touched.

Possible fix: replace

source.encode!('UTF-8')

with

source = source.encode('UTF-8')

(Related nanoc issues: nanoc/nanoc#276, nanoc/nanoc#277)

[gettalong]

Yep, you are right.