use environments to lazily initialize benchmarks #204
Merged
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if we only need to run a few benchmarks,
e.g.
text-benchmarks Pure/drop/Text+tiny
it's wasteful to initialize all of them
(and read all the test data in memory - all
the test data is a few hundreds of MB, but
we read it in several tests, as different types,
and most seriously, as String - which turns this
into GBs of memory)