diff --git a/runtime/lua/vim/func.lua b/runtime/lua/vim/func.lua
index 47067ec4b9..654f2e6299 100644
--- a/runtime/lua/vim/func.lua
+++ b/runtime/lua/vim/func.lua
@@ -24,13 +24,10 @@ local M = {}
 --- @generic F: function
 --- @param hash integer|string|function Hash function to create a hash to use as a key to
 ---     store results. Possible values:
----     - When integer, refers to the index of an argument of {fn} to hash.
----     This argument can have any type.
+---     - When integer, refers to the index of a {fn} argument (of any type) to hash.
 ---     - When function, is evaluated using the same arguments passed to {fn}.
----     - When `concat`, the hash is determined by string concatenating all the
----     arguments passed to {fn}.
----     - When `concat-n`, the hash is determined by string concatenating the
----     first n arguments passed to {fn}.
+---     - When "concat", hash is determined by string-concatenating all {fn} arguments.
+---     - When "concat-n", hash is determined by string-concatenating the first n {fn} arguments.
 ---
 --- @param fn F Function to memoize.
 --- @param weak? boolean Use a weak table (default `true`)
diff --git a/runtime/lua/vim/lsp.lua b/runtime/lua/vim/lsp.lua
index db17f992ba..cfa3d04461 100644
--- a/runtime/lua/vim/lsp.lua
+++ b/runtime/lua/vim/lsp.lua
@@ -113,26 +113,6 @@ function lsp._buf_get_full_text(bufnr)
   return text
 end
 
---- Memoizes a function. On first run, the function return value is saved and
---- immediately returned on subsequent runs. If the function returns a multival,
---- only the first returned value will be memoized and returned. The function will only be run once,
---- even if it has side effects.
----
----@generic T: function
----@param fn (T) Function to run
----@return T
-local function once(fn)
-  local value --- @type function
-  local ran = false
-  return function(...)
-    if not ran then
-      value = fn(...) --- @type function
-      ran = true
-    end
-    return value
-  end
-end
-
 --- @param client vim.lsp.Client
 --- @param config vim.lsp.ClientConfig
 --- @return boolean
@@ -832,7 +812,7 @@ end
 local function text_document_did_save_handler(bufnr)
   bufnr = vim._resolve_bufnr(bufnr)
   local uri = vim.uri_from_bufnr(bufnr)
-  local text = once(lsp._buf_get_full_text)
+  local text = vim.func._memoize('concat', lsp._buf_get_full_text)
   for _, client in ipairs(lsp.get_clients({ bufnr = bufnr })) do
     local name = api.nvim_buf_get_name(bufnr)
     local old_name = changetracking._get_and_set_name(client, bufnr, name)