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9e3a6ccf69
Allow SetMatrix to be used as a value type with a ready-to-use zero value. SetMatrix values are already non-copyable by virtue of having a mutex field so there is no harm in allowing non-pointer values to be used as local variables or struct fields. Any attempts to pass around by-value copies, e.g. as function arguments, will be flagged by go vet. Signed-off-by: Cory Snider <csnider@mirantis.com>