Re: [w3ctag/design-reviews] Sync Methods for FileSystemSyncAccessHandle in File System Access API (Issue #772)

If the high-level concern here is that we don't want to end up in a world with sync and async versions of every API, then, well, I agree :) This API is a particularly performance-oriented exception, not the rule.

The purpose of this API _is_ performance. SyncAccessHandles are intended to provide _the most_ low-level persistent file primitive to the web. This primitive allows sites to bring their own database to the web via Wasm in a way that's orders of magnitude faster than IndexedDB, for example.

Also I realize this isn't clear based on the issue description, but SyncAccessHandles are only available from DedicatedWorkers specifically because we don't want to impact the responsiveness of sites.

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