diff --git a/tabular.lua b/tabular.lua
index d6b4e4f..15a75ac 100644
--- a/tabular.lua
+++ b/tabular.lua
@@ -1,6 +1,10 @@
-local _tl_compat; if (tonumber((_VERSION or ''):match('[%d.]*$')) or 0) < 5.3 then local p, m = pcall(require, 'compat53.module'); if p then _tl_compat = m end end; local ipairs = _tl_compat and _tl_compat.ipairs or ipairs; local math = _tl_compat and _tl_compat.math or math; local os = _tl_compat and _tl_compat.os or os; local pairs = _tl_compat and _tl_compat.pairs or pairs; local string = _tl_compat and _tl_compat.string or string; local table = _tl_compat and _tl_compat.table or table; local utf8 = _tl_compat and _tl_compat.utf8 or utf8; local tabular = {}
+local _tl_compat; if (tonumber((_VERSION or ''):match('[%d.]*$')) or 0) < 5.3 then local p, m = pcall(require, 'compat53.module'); if p then _tl_compat = m end end; local ipairs = _tl_compat and _tl_compat.ipairs or ipairs; local math = _tl_compat and _tl_compat.math or math; local os = _tl_compat and _tl_compat.os or os; local pairs = _tl_compat and _tl_compat.pairs or pairs; local string = _tl_compat and _tl_compat.string or string; local table = _tl_compat and _tl_compat.table or table; local utf8 = _tl_compat and _tl_compat.utf8 or utf8
+
+
+
+local tabular = {}
+
 
-local AnsiColors = {}
 
 
 
@@ -63,7 +67,7 @@ if (os.getenv("LANG") or ""):upper():match("UTF%-?8") then
 
 end
 
-local Output = {}
+
 
 
 
@@ -80,7 +84,7 @@ local function escape_chars(c)
    return "\\" .. string.byte(c)
 end
 
-local Pair = {}
+
 
 local function show_as_list(t, color, seen, ids, skip_array)
    local tt = {}
@@ -136,7 +140,7 @@ local function show_primitive(t)
    return out
 end
 
-local Row = {}
+
 
 
 
@@ -194,7 +198,7 @@ show_as_columns = function(t, bgcolor, seen, ids, column_order, skip_header)
       elseif bgcolor then
          table.insert(line, bgcolor)
       end
-      table.insert(line, text .. (" "):rep(w - strlen(text)))
+      table.insert(line, text .. (" "):rep((w - strlen(text))))
       if color then
          table.insert(line, bgcolor)
       end
@@ -236,7 +240,7 @@ show_as_columns = function(t, bgcolor, seen, ids, column_order, skip_header)
          local line = { draw.V }
          for _, cname in ipairs(column_names) do
             local row = columns[cname][i]
-            output_cell(line, cname, row and row[h] or "", bgcolor and colors[(i % #colors) + 1])
+            output_cell(line, cname, row and row[math.floor(h)] or "", bgcolor and colors[(i % #colors) + 1])
          end
          output_line(out, table.concat(line))
       end
@@ -266,7 +270,7 @@ show = function(t, color, seen, ids, column_order)
 
    if type(t) == "table" then
       local tt = t
-      if #tt > 0 and type(tt[1]) == "table" then
+      if #(tt) > 0 and type(tt[1]) == "table" then
          return show_as_columns(tt, color, seen, ids, column_order)
       else
          return show_as_list(tt, color, seen, ids)
@@ -302,4 +306,8 @@ if arg and arg[0]:match("tabular%..*$") then
    os.exit(0)
 end
 
-return setmetatable(tabular, { __call = function(_, ...) return tabular.show(...) end })
+return setmetatable(tabular, {
+   __call = function(_, ...)
+      return tabular.show(...)
+   end,
+})
diff --git a/tabular.tl b/tabular.tl
index 4b7321e..e465afa 100644
--- a/tabular.tl
+++ b/tabular.tl
@@ -1,4 +1,8 @@
-local tabular = {}
+local record Tabular
+    show: function(t: any, column_order?: {string}, color?: boolean): string
+end
+
+local tabular: Tabular = {}
 
 local record AnsiColors
   noReset: function(string):string
@@ -26,7 +30,7 @@ local colors: {string} = {
   ansicolors.noReset("%{white}"),
 }
 
-local function strlen(s: string): number
+local function strlen(s: string): integer
   s = s:gsub("\27[^m]*m", "")
   return #s
 end
@@ -48,17 +52,17 @@ if (os.getenv("LANG") or ""):upper():match("UTF%-?8") then
     X = "┼",
   }
 
-  strlen = function(s: string): number
+  strlen = function(s: string): integer
     s = s:gsub("\27[^m]*m", "")
-    return utf8.len(s) or #s
+    return utf8.len(s) as integer or #s
   end
 
   strsub = function(s: string, i: number, j: number): string
-    local uj = utf8.offset(s, j + 1)
+    local uj: number = utf8.offset(s, j + 1)
     if uj then
       uj = uj - 1
     end
-    return s:sub(utf8.offset(s, i), uj)
+    return s:sub(utf8.offset(s, i) as integer, uj as integer)
   end
 
 end
@@ -68,8 +72,8 @@ local record Output
   width: number
 end
 
-local show: function(any, string, {any:boolean}, {any:number}, {string}):Output
-local show_as_columns: function({{any:any}}, string, {any:boolean}, {any:number}, {string}, boolean): Output
+local show: function(any, string, {any:boolean}, {any:number}, ?{string}):Output
+local show_as_columns: function({{any:any}}, string, {any:boolean}, {any:number}, {string}, ?boolean): Output
 
 local function output_line(out: Output, line: string)
   table.insert(out, line)
@@ -82,7 +86,7 @@ end
 
 local type Pair = {string, any}
 
-local function show_as_list(t: {any:any}, color: string, seen: {any:boolean}, ids: {any:number}, skip_array: boolean): Output
+local function show_as_list(t: {any:any}, color: string, seen: {any:boolean}, ids: {any:number}, skip_array?: boolean): Output
   local tt: {Pair} = {}
   local width = 0
   local keys = {}
@@ -186,7 +190,7 @@ show_as_columns = function(t: {{any:any}}, bgcolor: string, seen: {any:boolean},
     table.sort(column_names)
   end
 
-  local function output_cell(line: {string}, cname: string, text: string, color: string)
+  local function output_cell(line: {string}, cname: string, text: string, color?: string)
     local w = columns[cname].width
     text = text or ""
     if color then
@@ -194,7 +198,7 @@ show_as_columns = function(t: {{any:any}}, bgcolor: string, seen: {any:boolean},
     elseif bgcolor then
       table.insert(line, bgcolor)
     end
-    table.insert(line, text .. (" "):rep(w - strlen(text)))
+    table.insert(line, text .. (" "):rep((w - strlen(text)) as integer))
     if color then
       table.insert(line, bgcolor)
     end
@@ -207,8 +211,8 @@ show_as_columns = function(t: {{any:any}}, bgcolor: string, seen: {any:boolean},
   local border_bot = {}
   for i, cname in ipairs(column_names) do
     local w = columns[cname].width
-    table.insert(border_top, draw.H:rep(w))
-    table.insert(border_bot, draw.H:rep(w))
+    table.insert(border_top, draw.H:rep(w as integer))
+    table.insert(border_bot, draw.H:rep(w as integer))
     if i < #column_names then
       table.insert(border_top, draw.N)
       table.insert(border_bot, draw.S)
@@ -236,7 +240,7 @@ show_as_columns = function(t: {{any:any}}, bgcolor: string, seen: {any:boolean},
       local line = { draw.V }
       for _, cname in ipairs(column_names) do
         local row = columns[cname][i]
-        output_cell(line, cname, row and row[h] or "", bgcolor and colors[(i % #colors) + 1])
+        output_cell(line, cname, row and row[math.floor(h)] or "", bgcolor and colors[(i % #colors) + 1])
       end
       output_line(out, table.concat(line))
     end
@@ -266,7 +270,7 @@ show = function(t: any, color: string, seen: {any:boolean}, ids: {any:number}, c
 
   if type(t) == "table" then
     local tt = t as {any:any}
-    if #tt > 0 and type(tt[1]) == "table" then
+    if #(tt as {any}) > 0 and type(tt[1]) == "table" then
       return show_as_columns(tt as {{any:any}}, color, seen, ids, column_order)
     else
       return show_as_list(tt, color, seen, ids)
@@ -276,7 +280,7 @@ show = function(t: any, color: string, seen: {any:boolean}, ids: {any:number}, c
   end
 end
 
-local function detect_cycles(t: any, n: number, seen: {any:number}): {any:number}, number
+local function detect_cycles(t: any, n?: number, seen?: {any:number}): {any:number}, number
   n = n or 0
   seen = seen or {}
   if type(t) == "table" then
@@ -292,7 +296,7 @@ local function detect_cycles(t: any, n: number, seen: {any:number}): {any:number
   return seen, n
 end
 
-function tabular.show(t: any, column_order: {string}, color: boolean): string
+function tabular.show(t: any, column_order?: {string}, color?: boolean): string
   local ids = detect_cycles(t)
   return table.concat(show(t, color and colors and ansicolors.noReset("%{reset}"), {}, ids, column_order), "\n")
 end
@@ -302,4 +306,8 @@ if arg and arg[0]:match("tabular%..*$") then
   os.exit(0)
 end
 
-return setmetatable( tabular, { __call = function(_, ...): string return tabular.show(...) end } )
+return setmetatable( tabular, { 
+    __call = function(_: Tabular, ...:any): string 
+        return tabular.show(... as {string}) 
+    end 
+} )