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There were a couple of reports of "Buffer X newer than edits" problems. We first assumed that it is incorrect for a server to send 0 as a version - and stated that they should send a `null` instead, given that in the specification the `textDocument` of a `TextDocumentEdit` is a `OptionalVersionedTextDocumentIdentifier`. But it turns out that this was a change in 3.16, and in 3.15 and earlier versions of the specification it was a `VersionedTextDocumentIdentifier` and language servers didn't have a better option than sending `0` if they don't keep track of the version numbers. So this changes the version check to always accept `0` values. See - https://github.com/neovim/neovim/issues/12970 - https://github.com/neovim/neovim/issues/14256 - https://github.com/haskell/haskell-language-server/pull/1727
