zodb / relstorage / 565

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travis-ci

Small but measurable write performance improvements

MySQL and PostgreSQL use a prepared statement to detect conflicts. This
is only noticeable when few objects are written.

Modernize the RowBatcher class by using defaultdict instead of manual
checks. Avoid doing some unnecessary sorting and defer string conversion
of deletes.

23 of 23 new or added lines in 3 files covered. (100.0%)

5003 of 5338 relevant lines covered (93.72%)

9.48 hits per line