diff --git a/Makefile b/Makefile
index 6250037..e9a2251 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 
 # Run all tests
 test:
-	nix eval --impure --expr 'import ./lib.test.nix {}'
+	nix eval --impure --expr 'import ./lib.test.nix {}' $(TEST_ARGS)
 
diff --git a/lib.nix b/lib.nix
index 1f483bf..7dce83a 100644
--- a/lib.nix
+++ b/lib.nix
@@ -24,6 +24,7 @@ let
 
   error = message: throw "[nix2lua] ${message}";
   warn = msg: builtins.trace "[nix2lua] warning: ${msg}";
+  deprecated = before: now: warn "`${before}` is deprecated. Use `${now}` instead";
 
   getType = expr: if isAttrs expr && expr ? _type then expr._type else null;
 
@@ -40,66 +41,71 @@ let
     if isList expr then { _type = "_join"; sep = validString sep; parts = expr; }
     else error "Value '${toString expr}' is not supported for a join type";
 
-  isLuaRaw = expr: getType expr == "raw";
-  mkLuaRaw = expr:
-    if isLuaRaw expr then
+  concat = join "";
+  concatLines = lines:
+    join "\n" (
+      lines
+      # add an empty line at the end
+      ++ [ (raw "") ]
+    );
+
+  isRaw = expr: getType expr == "raw";
+  raw = expr:
+    if isRaw expr then
       { _type = "raw"; raw = expr.raw; }
     else if isString expr then
       { _type = "raw"; raw = expr; }
     else
       error "Value '${toString expr}' is not supported for a raw type";
 
-  mkCall = fnName: args:
+  call = fnName: args:
     let
       luaFn =
-        if isString fnName && builtins.stringLength fnName > 0 then mkLuaRaw fnName
+        if isString fnName && builtins.stringLength fnName > 0 then raw fnName
         else error "Value '${toString fnName}' is not a valid function name";
     in
-    join "" (
-      [ luaFn (mkLuaRaw "(") ]
+    concat (
+      [ luaFn (raw "(") ]
       ++ [ (join ", " args) ]
-      ++ [ (mkLuaRaw ")") ]
+      ++ [ (raw ")") ]
     );
 
-  toLuaStr = expr: "\"${validString expr}\"";
-  toLuaBool = expr: if expr then "true" else "false";
-
   isLuaNil = expr: getType expr == "nil";
   LuaNil = { _type = "nil"; };
-  # DEPRECATED
-  mkLuaNil = warn "`mkLuaNil` is deprecated. Use `LuaNil` instead" LuaNil;
 
+  isNamedField = expr: getType expr == "table_field";
+  namedField = name: expr: {
+    _type = "table_field";
+    name = validString name;
+    value = toLua expr;
+  };
+
+  toLuaBool = expr: if expr then "true" else "false";
+  toLuaNumber = toString;
+  toLuaString = expr: "\"${validString expr}\"";
   toLuaList = onValue: expr:
     let
       wrapObj = expr: "{ ${concatStringsSep ", " expr} }";
       excludeNull = expr: filter (v: !(isNull v)) expr;
     in
     wrapObj (excludeNull (map onValue expr));
-
-  toLuaTable = onValue: expr: onValue (attrValues (mapAttrs mkNamedField expr));
-
-  mkNamedField = name: expr: {
-    _type = "table_field";
-    name = validString name;
-    value = toLua expr;
-  };
-  isNamedField = expr: getType expr == "table_field";
   toLuaNamedField = name: expr:
     if isNull expr then null
-    else "[${toLuaStr name}] = ${expr}";
+    else "[${toLuaString name}] = ${expr}";
+  toLuaTable = onValue: expr: onValue (attrValues (mapAttrs namedField expr));
 
   toLuaInternal = depth: expr:
     let nextDepth = depth + 1; in
     if isJoin expr then concatStringsSep expr.sep (map (toLuaInternal depth) expr.parts)
     else if isLuaNil expr then "nil"
-    else if isLuaRaw expr then expr.raw
+    else if isRaw expr then expr.raw
     else if isNamedField expr then
       if depth > 0 then toLuaNamedField expr.name expr.value
       else error "You cannot render table field at the top level"
     else if isAttrs expr then toLuaTable (toLuaInternal nextDepth) expr
     else if isList expr then toLuaList (toLuaInternal nextDepth) expr
-    else if isString expr || isPath expr then toLuaStr expr
-    else if isFloat expr || isInt expr then toString expr
+    else if isString expr || isPath expr then toLuaString expr
+    else if isFloat expr || isInt expr then toLuaNumber expr
     else if isBool expr then toLuaBool expr
     else if isNull expr then null
     else error "Value '${toString expr}' is not supported yet";
@@ -108,11 +114,15 @@ let
 
 in
 {
-  # low-level
-  inherit join;
+  # Deprecated
+  mkLuaNil = deprecated "mkLuaNil" "Nil" LuaNil;
+  mkLuaRaw = deprecated "mkLuaRaw" "raw" raw;
+  mkCall = deprecated "mkCall" "call" call;
+  mkNamedField = deprecated "mkNamedField" "namedField" namedField;
 
   inherit toLua;
-  inherit LuaNil mkLuaRaw mkNamedField mkCall;
-  # DEPRECATED
-  inherit mkLuaNil;
+
+  inherit LuaNil;
+  inherit raw join concat concatLines;
+  inherit call namedField;
 }
diff --git a/lib.test.nix b/lib.test.nix
index db3e960..4611ce1 100644
--- a/lib.test.nix
+++ b/lib.test.nix
@@ -18,12 +18,11 @@
 
 let
   nix2lua = import ./lib.nix;
-  inherit (nix2lua) toLua LuaNil mkLuaRaw mkNamedField mkCall;
   inherit (builtins) tryEval;
 
   failed = { success = false; value = false; };
 in
-pkgs.lib.runTests {
+with nix2lua; pkgs.lib.runTests {
   "test returns null" = {
     expr = toLua null;
     expected = null;
@@ -99,17 +98,17 @@ pkgs.lib.runTests {
   "test returns table with one named field" = {
     expr = toLua [
       "foo"
-      (mkNamedField "foo" "hello")
+      (namedField "foo" "hello")
       10
     ];
     expected = "{ \"foo\", [\"foo\"] = \"hello\", 10 }";
   };
   "test returns raw string" = {
-    expr = toLua (mkLuaRaw "hello");
+    expr = toLua (raw "hello");
     expected = "hello";
   };
   "test returns deep raw string" = {
-    expr = toLua (mkLuaRaw (mkLuaRaw (mkLuaRaw "hello")));
+    expr = toLua (raw (raw (raw "hello")));
     expected = "hello";
   };
   "test returns path as string" = {
@@ -117,11 +116,21 @@ pkgs.lib.runTests {
     expected = "\"/foo/bar\"";
   };
   "test throws an error when you try to use named field withoun table" = {
-    expr = tryEval (toLua (mkNamedField "foo" "bar"));
+    expr = tryEval (toLua (namedField "foo" "bar"));
     expected = failed;
   };
   "test returns call function with arguments" = {
-    expr = toLua (mkCall "root_pattern" [ "deno.json" "deno.jsonc" ]);
+    expr = toLua (call "root_pattern" [ "deno.json" "deno.jsonc" ]);
     expected = "root_pattern(\"deno.json\", \"deno.jsonc\")";
   };
+  "test returns concated lines" = {
+    expr = toLua (concatLines [
+      (call "foo" [ 1 2 ])
+      (call "bar" [ "baz" "biz" ])
+    ]);
+    expected = ''
+      foo(1, 2)
+      bar("baz", "biz")
+    '';
+  };
 }