Allows mutable access to a MemoryWriter's underlying buffer. No-Docs-Update-Reason: Changing a data() accessor to non-const. Change-Id: I02a1c21e670ba63f6de98441a851eddc03095cf5 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45001 Reviewed-by: Wyatt Hepler <hepler@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
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