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The class `lsp.Client` has a public member `server_capabilities`, which is assumed to be non-nil once initialized, as documented in `:help vim.lsp.client`. Due to the possibility that it may be nil before initialization, `lsp.Client` was not having a proper lua type annotations on the field `server_capabilities`. Instead of having a nil `server_capabilities` until initialized in the RPC response callback, we can have an initial value of empty table. This CHANGES the behavior of the `server_capabilities` field in a way that it is no longer `nil` until initialization. Note that, as already documented, `server_capabilities` should never be nil when it is once initialized and thus ready to be used in user configs.