Always indent top-level scalars with lines starting with document markers #162
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This was noticed by @ingydotnet: Top-level scalars with content that includes document markers, i.e. lines starting with
---
or...
, were not being indented. This is a problem, as the output would then be erroneously parsed.This PR adds checks to the string stringifier for this particular case, and if necessary indents the content by two spaces.