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a6734766ec
Else, we store an empty but allocated string for each Attribute after a href was emitted (since it's ended by a non-null empty string), which makes Line objects very expensive to destroy and to modify. Reduces `disasm /bin/id` from 414ms to 380ms (min-of-5). There's a lot more perf wins to be had with better href handling (most lines don't have any hrefs, so instead of storing a string per Attr, maybe we could have a vector of hrefs per line and int offsets into that in each Attr for example), but this is a simple, obvious, and effective improvement, so let's start with this.