buffer: Force copy when appending small slices to OwnedImpl buffer to… #178
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… avoid fragmentation (#117)
Change OwnedImpl::move to force a copy instead of taking ownership of slices in cases where the offered slices are below kCopyThreshold
Risk Level: medium, changes to buffer behavior
Testing: Unit Tests
Docs Changes: N/A
Release Notes: N/A
Signed-off-by: Antonio Vicente avd@google.com