diff --git a/anselme.lua b/anselme.lua
index 04977a4..5c99c82 100644
--- a/anselme.lua
+++ b/anselme.lua
@@ -43,11 +43,16 @@
 -- end
 -- ```
 
-local parser = require("parser")
-local State = require("state.State")
-require("ast.abstract.Node"):_i_hate_cycles()
+-- LuaJIT compatibility
+-- TODO: too heavyhanded
+if _VERSION == "Lua 5.1" then
+	package.path = "./?/init.lua;" .. package.path
+	table.unpack = unpack
+end
 
-return {
+local parser, State
+
+local anselme = {
 	--- Global version string. Follow semver.
 	version = "2.0.0-alpha",
 
@@ -78,3 +83,11 @@ return {
 		return State:new()
 	end,
 }
+
+package.loaded[...] = anselme
+
+parser = require("parser")
+State = require("state.State")
+require("ast.abstract.Node"):_i_hate_cycles()
+
+return anselme
diff --git a/ast/abstract/Node.lua b/ast/abstract/Node.lua
index aa785bb..7ca1106 100644
--- a/ast/abstract/Node.lua
+++ b/ast/abstract/Node.lua
@@ -1,6 +1,7 @@
 local class = require("class")
 local fmt = require("common").fmt
 local binser = require("lib.binser")
+local utf8 = utf8 or require("lua-utf8")
 
 -- NODES SHOULD BE IMMUTABLE AFTER CREATION IF POSSIBLE!
 -- i don't think i actually rely on this behavior for anything but it makes me feel better about life in general
diff --git a/doc/gendocs.lua b/doc/gendocs.lua
index 60a0eda..dc6ad22 100644
--- a/doc/gendocs.lua
+++ b/doc/gendocs.lua
@@ -2,6 +2,8 @@
 -- Behold! A documentation generator that doesn't try to be smart!
 -- Call this from the root anselme directory: `lua doc/gendocs.lua`
 
+local utf8 = utf8 or require("lua-utf8")
+
 local files = {
 	"doc/api.md"
 }
diff --git a/parser/Source.lua b/parser/Source.lua
index b74df20..2b397d1 100644
--- a/parser/Source.lua
+++ b/parser/Source.lua
@@ -1,4 +1,5 @@
 local class = require("class")
+local utf8 = utf8 or require("lua-utf8")
 
 local Source
 Source = class {
diff --git a/parser/code_to_tree.lua b/parser/code_to_tree.lua
index ad220ba..32db680 100644
--- a/parser/code_to_tree.lua
+++ b/parser/code_to_tree.lua
@@ -1,5 +1,7 @@
 --- transform raw code string into a nested tree of lines
 
+local utf8 = utf8 or require("lua-utf8")
+
 local Source = require("parser.Source")
 
 local function indented_to_tree(indented)
diff --git a/parser/expression/comment.lua b/parser/expression/comment.lua
index cdc55fb..3d22115 100644
--- a/parser/expression/comment.lua
+++ b/parser/expression/comment.lua
@@ -30,7 +30,7 @@ comment = primary {
 				subcomment, rem = comment:parse(source, rem, limit_pattern)
 
 				table.insert(content_list, "((")
-				for _, c in ipairs(subcomment) do table.insert(content_list, c) end
+				table.insert(content_list, subcomment)
 				table.insert(content_list, "))")
 			-- no end token after the comment
 			elseif not rem:match("^%)%)") then
diff --git a/readme.md b/readme.md
index 2dbc974..2e486ca 100644
--- a/readme.md
+++ b/readme.md
@@ -1,3 +1,5 @@
 # Anselme
 
 The overengineered dialog scripting system in pure Lua.
+
+Supported: Lua 5.4, Lua 5.3, LuaJIT (LuaJIT requires the utf8 module: `luarocks --lua-version=5.1 install luautf8`).
diff --git a/stdlib/number.lua b/stdlib/number.lua
index cea03eb..7e79b1d 100644
--- a/stdlib/number.lua
+++ b/stdlib/number.lua
@@ -42,7 +42,7 @@ return {
 	{ "_-_", "(a::number, b::number)", function(state, a, b) return Number:new(a.number - b.number) end },
 	{ "_*_", "(a::number, b::number)", function(state, a, b) return Number:new(a.number * b.number) end },
 	{ "_/_", "(a::number, b::number)", function(state, a, b) return Number:new(a.number / b.number) end },
-	{ "_//_", "(a::number, b::number)", function(state, a, b) return Number:new(a.number // b.number) end },
+	{ "_//_", "(a::number, b::number)", function(state, a, b) return Number:new(math.floor(a.number / b.number)) end },
 	{ "_%_", "(a::number, b::number)", function(state, a, b) return Number:new(a.number % b.number) end },
 	{ "_^_", "(a::number, b::number)", function(state, a, b) return Number:new(a.number ^ b.number) end },
 	{ "-_", "(a::number)", function(state, a) return Number:new(-a.number) end },