servo_arc: make track_alloc_size feature a default feature #174
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Objective
Fixes #129 for users that have default features enabled (and it will be the only default feature so there's no reason not to have default features enabled).
Changes made
track_alloc_size
feature a default featureservo_arc
to0.4.1
Alternatives
Arguably ought to be the behaviour with no features enabled, and there ought to be a
dont_track_alloc_size
feature that disables the tracking for Gecko (I believe the combination of having this disabled and using an allocator that requires accurate tracking is actually UB), but this is the simpler change that will likely fix the problem for almost everyone in practice.