Touch all output files #120
Merged
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Instead of only touching files which are considered up-to-date, this change just touches all output files. This improves incremental builds by ensuring that all files have the same timestamp as opposed to being non-deterministically slightly different, which can lead to incrementality issues if, for example, an intermediate outputs is newer than a final outputs.
This is put behind yet another flag since setting this metadata on every file is not free. At some point I may need to consider whether to group a bunch of these flags together under an umbrella "enable incremental builds" flag or something.