google / go-jsonnet / 763

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Adaptive string representation

When adding long strings, don't copy them immediately. Instead
build long strings only when their contents are requested.

This allows to build a long string from parts, using a regular
operator+ in linear time. This lets users to worry much less
about using std.join etc.

If indexing the string is mixed with building it using operator+
the behavior can still be quadratic. We may want to address it in
a later change.

135 of 135 new or added lines in 4 files covered. (100.0%)

14208 of 18198 relevant lines covered (78.07%)

8992.05 hits per line