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Problem: LSP error responses implicitly rely on a custom `__tostring` function (`vim.lsp.rpc.format_rpc_error`) for formatting. This causes errors that are not created via `vim.lsp.rpc.error` to behave inconsistently with those that are. Furthermore, we usually use `log.error` to print these errors, which uses `vim.inspect` under the hood, so the custom `__tostring` provides little benefit. This increases the difficulty of refactoring the code, as it tightly couples RPC error handling with the LSP. Solution: Convert every potential `__tostring` call to an explicit one. Since we don't describe this behavior in the documentation, this should not be a breaking change.