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I tried turning on `@enablePreserveExistingMemoizationGuarantees` by default and cleaned up a couple small things: * We emit freeze calls for StartMemoize deps but these had ValueReason.Other so the message wasn't great. We now treat these like other hook arguments. * PruneNonEscapingScopes was being too aggressive in this mode and memoizing even loads of globals. Switching to MemoizationLevel.Conditional ensures we build a graph that connects through to primitive-returning function calls, but doesn't unnecessarily force memoization otherwise. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34346). * #34347 * __->__ #34346