1 files changed, 26 insertions, 32 deletions

diff --git a/Master/texmf-dist/tex/luatex/lualibs/lualibs-util-sto.lua b/Master/texmf-dist/tex/luatex/lualibs/lualibs-util-sto.lua
index 191d6cd73b2..8aafca425b8 100644
--- a/Master/texmf-dist/tex/luatex/lualibs/lualibs-util-sto.lua
+++ b/Master/texmf-dist/tex/luatex/lualibs/lualibs-util-sto.lua
@@ -103,12 +103,22 @@ end
 local function f_empty ()                           return "" end -- t,k
 local function f_self  (t,k) t[k] = k               return k  end
 local function f_table (t,k) local v = { } t[k] = v return v  end
+local function f_number(t,k) t[k] = 0               return 0  end -- t,k,v
 local function f_ignore()                                     end -- t,k,v
 
-local t_empty  = { __index    = f_empty  }
-local t_self   = { __index    = f_self   }
-local t_table  = { __index    = f_table  }
-local t_ignore = { __newindex = f_ignore }
+local f_index = {
+    ["empty"]  = f_empty,
+    ["self"]   = f_self,
+    ["table"]  = f_table,
+    ["number"] = f_number,
+}
+
+local t_index = {
+    ["empty"]  = { __index = f_empty  },
+    ["self"]   = { __index = f_self   },
+    ["table"]  = { __index = f_table  },
+    ["number"] = { __index = f_number },
+}
 
 function table.setmetatableindex(t,f)
     if type(t) ~= "table" then
@@ -116,46 +126,30 @@ function table.setmetatableindex(t,f)
     end
     local m = getmetatable(t)
     if m then
-        if f == "empty" then
-            m.__index = f_empty
-        elseif f == "key" then
-            m.__index = f_self
-        elseif f == "table" then
-            m.__index = f_table
-        else
-            m.__index = f
-        end
+        m.__index = f_index[f] or f
     else
-        if f == "empty" then
-            setmetatable(t, t_empty)
-        elseif f == "key" then
-            setmetatable(t, t_self)
-        elseif f == "table" then
-            setmetatable(t, t_table)
-        else
-            setmetatable(t,{ __index = f })
-        end
+        setmetatable(t,t_index[f] or { __index = f })
     end
     return t
 end
 
+local f_index = {
+    ["ignore"] = f_ignore,
+}
+
+local t_index = {
+    ["ignore"] = { __newindex = f_ignore },
+}
+
 function table.setmetatablenewindex(t,f)
     if type(t) ~= "table" then
         f, t = t, { }
     end
     local m = getmetatable(t)
     if m then
-        if f == "ignore" then
-            m.__newindex = f_ignore
-        else
-            m.__newindex = f
-        end
+        m.__newindex = f_index[f] or f
     else
-        if f == "ignore" then
-            setmetatable(t, t_ignore)
-        else
-            setmetatable(t,{ __newindex = f })
-        end
+        setmetatable(t,t_index[f] or { __newindex = f })
     end
     return t
 end