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Depending on the system, mtime resolution might not be perfectly accurate. Particularly containers appear to have imprecise mtimes. Wait a short time period before writing the new file to avoid situations like the following: - We index a source file and the unit receives a time stamp and wait for indexing to finish - We modify the source file but so quickly after the unit has been modified that the updated source file receives the same mtime as the unit file - We now assume that the we have an up-to-date index for this source file even though we do not. Waiting 10ms appears to be enough to avoid this situation on the systems we care about. rdar://147811044