diff --git a/index.d.ts b/index.d.ts
index 74ff581..2d769a7 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -187,7 +187,7 @@ export interface ChalkInstance extends ChalkFunction {
 	Use a [8-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) to set text color.
 	*/
 	ansi256: (index: number) => this;
-	
+
 	/**
 	Use RGB values to set background color.
 	*/
diff --git a/readme.md b/readme.md
index 79dd4d0..ed9b312 100644
--- a/readme.md
+++ b/readme.md
@@ -274,7 +274,7 @@ console.log(chalk.bold.rgb(10, 100, 200)`Hello!`);
 console.log(chalk`{bold.rgb(10,100,200) Hello!}`);
 ```
 
-Note that function styles (`rgb()`, `hsl()`, `keyword()`, etc.) may not contain spaces between parameters.
+Note that function styles (`rgb()`, `hsl()`, etc.) may not contain spaces between parameters.
 
 All interpolated values (`` chalk`${foo}` ``) are converted to strings via the `.toString()` method. All curly braces (`{` and `}`) in interpolated value strings are escaped.
 
@@ -289,7 +289,7 @@ Examples:
 - `chalk.hex('#DEADED').underline('Hello, world!')`
 - `chalk.rgb(15, 100, 204).inverse('Hello!')`
 
-Background versions of these models are prefixed with `bg` and the first level of the module capitalized (e.g. `keyword` for foreground colors and `bgKeyword` for background colors).
+Background versions of these models are prefixed with `bg` and the first level of the module capitalized (e.g. `hex` for foreground colors and `bgHex` for background colors).
 
 - `chalk.bgHex('#DEADED').underline('Hello, world!')`
 - `chalk.bgRgb(15, 100, 204).inverse('Hello!')`
diff --git a/source/index.js b/source/index.js
index 9f5f679..79bdabc 100644
--- a/source/index.js
+++ b/source/index.js
@@ -10,12 +10,12 @@ const {stdout: stdoutColor, stderr: stderrColor} = supportsColor;
 const {isArray} = Array;
 
 // `supportsColor.level` → `ansiStyles.color[name]` mapping
-const levelMapping = new Set([
+const levelMapping = [
 	'ansi256',
 	'ansi256',
 	'ansi256',
 	'ansi16m'
-]);
+];
 
 const styles = Object.create(null);
 
diff --git a/test/chalk.js b/test/chalk.js
index adc1aed..035ad30 100644
--- a/test/chalk.js
+++ b/test/chalk.js
@@ -93,11 +93,6 @@ test('line breaks should open and close colors with CRLF', t => {
 	t.is(chalk.grey('hello\r\nworld'), '\u001B[90mhello\u001B[39m\r\n\u001B[90mworld\u001B[39m');
 });
 
-test('properly convert RGB to 16 colors on basic color terminals', t => {
-	t.is(new Chalk({level: 1}).hex('#FF0000')('hello'), '\u001B[91mhello\u001B[39m');
-	t.is(new Chalk({level: 1}).bgHex('#FF0000')('hello'), '\u001B[101mhello\u001B[49m');
-});
-
 test('properly convert RGB to 256 colors on basic color terminals', t => {
 	t.is(new Chalk({level: 2}).hex('#FF0000')('hello'), '\u001B[38;5;196mhello\u001B[39m');
 	t.is(new Chalk({level: 2}).bgHex('#FF0000')('hello'), '\u001B[48;5;196mhello\u001B[49m');
diff --git a/test/template-literal.js b/test/template-literal.js
index 773e097..e8d5950 100644
--- a/test/template-literal.js
+++ b/test/template-literal.js
@@ -150,18 +150,18 @@ test('correctly parses unicode/hex escapes', t => {
 
 test('correctly parses string arguments', t => {
 	const instance = new Chalk({level: 3});
-	t.is(instance`{keyword('black').bold can haz cheezburger}`, '\u001B[38;2;0;0;0m\u001B[1mcan haz cheezburger\u001B[22m\u001B[39m');
-	t.is(instance`{keyword('blac\x6B').bold can haz cheezburger}`, '\u001B[38;2;0;0;0m\u001B[1mcan haz cheezburger\u001B[22m\u001B[39m');
-	t.is(instance`{keyword('blac\u006B').bold can haz cheezburger}`, '\u001B[38;2;0;0;0m\u001B[1mcan haz cheezburger\u001B[22m\u001B[39m');
+	t.is(instance`{hex('#000000').bold can haz cheezburger}`, '\u001B[38;2;0;0;0m\u001B[1mcan haz cheezburger\u001B[22m\u001B[39m');
+	t.is(instance`{hex('#00000\x30').bold can haz cheezburger}`, '\u001B[38;2;0;0;0m\u001B[1mcan haz cheezburger\u001B[22m\u001B[39m');
+	t.is(instance`{hex('#00000\u0030').bold can haz cheezburger}`, '\u001B[38;2;0;0;0m\u001B[1mcan haz cheezburger\u001B[22m\u001B[39m');
 });
 
 test('throws if a bad argument is encountered', t => {
 	const instance = new Chalk({level: 3}); // Keep level at least 1 in case we optimize for disabled chalk instances
 	try {
-		console.log(instance`{keyword(????) hi}`);
+		console.log(instance`{hex(????) hi}`);
 		t.fail();
 	} catch (error) {
-		t.is(error.message, 'Invalid Chalk template style argument: ???? (in style \'keyword\')');
+		t.is(error.message, 'Invalid Chalk template style argument: ???? (in style \'hex\')');
 	}
 });