Remove allocations in Markup by switching to Cow<'static, str>
#585
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Now strings are only allocated if non-static (The vast majority of markup strings are `&'static`)
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Now strings are only allocated if non-static. (The vast majority of markup strings are
&'static.)There is of course a cost associated with this, the cost of checking the
Cowvariant, but given the number of static strings in use for markup, there's no way that this is a greater cost than allocating those as strings.