Do not mutate DOMDocument #175
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A DOMDocument instance being passed to the parser should not have changed after parsing. This could potentially trip-up further use of the same DOMDocument instance. See microformats#174.
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Fixes #174. Thanks to @gRegorLove for confirming this behaviour and @kartikprabhu for thinking about it!
I wrote the test first, and it seems a simple
cloneis indeed enough to get it to pass.