Improve the codes for sumneko friendly

lua/cmp/utils/binary.lua

@@ -3,7 +3,7 @@ local binary = {}
 ---Insert item to list to ordered index
 ---@param list any[]
 ---@param item any
----@param func fun(a: any, b: any): "1"|"-1"|"0"
+---@param func fun(a: any, b: any): 1|-1|0
 binary.insort = function(list, item, func)
   table.insert(list, binary.search(list, item, func), item)
 end
@@ -11,7 +11,7 @@ end
 ---Search suitable index from list
 ---@param list any[]
 ---@param item any
----@param func fun(a: any, b: any): "1"|"-1"|"0"
+---@param func fun(a: any, b: any): 1|-1|0
 ---@return number
 binary.search = function(list, item, func)
   local s = 1

lua/cmp/utils/char.lua

@@ -1,20 +1,22 @@
+local _
+
 local alpha = {}
-string.gsub('abcdefghijklmnopqrstuvwxyz', '.', function(char)
+_ = string.gsub('abcdefghijklmnopqrstuvwxyz', '.', function(char)
   alpha[string.byte(char)] = true
 end)
 
 local ALPHA = {}
-string.gsub('ABCDEFGHIJKLMNOPQRSTUVWXYZ', '.', function(char)
+_ = string.gsub('ABCDEFGHIJKLMNOPQRSTUVWXYZ', '.', function(char)
   ALPHA[string.byte(char)] = true
 end)
 
 local digit = {}
-string.gsub('1234567890', '.', function(char)
+_ = string.gsub('1234567890', '.', function(char)
   digit[string.byte(char)] = true
 end)
 
 local white = {}
-string.gsub(' \t\n', '.', function(char)
+_ = string.gsub(' \t\n', '.', function(char)
   white[string.byte(char)] = true
 end)
 

lua/cmp/utils/misc.lua

@@ -134,7 +134,7 @@ misc.safe = function(v)
 end
 
 ---Treat 1/0 as bool value
----@param v boolean|"1"|"0"
+---@param v boolean|1|0
 ---@param def boolean
 ---@return boolean
 misc.bool = function(v, def)