stop prereserving space in toAppend
Summary: previous change would cause reserving as much as needed in toAppend for all arguements. This had bad consequences for appending in a loop, described here: https://phabricator.fb.com/D1420588#22 Not split the interfaces so that user has to decide Test Plan: unit tests Reviewed By: soren@fb.com Subscribers: trunkagent, njormrod FB internal diff: D1601614 Tasks: 5303991
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