diff --git a/spec.emu b/spec.emu
index ef44d42..461eefe 100644
--- a/spec.emu
+++ b/spec.emu
@@ -49,8 +49,8 @@ copyright: false
     1. If _windowSize_ is not an integral Number in the inclusive interval from *1*<sub>𝔽</sub> to 𝔽(2<sup>32</sup> - 1), then
       1. Let _error_ be ThrowCompletion(a newly created *RangeError* object).
       1. Return ? IteratorClose(_iterated_, _error_).
-    1. If _undersized_ is *undefined*, set _undersized_ to *"only full"*.
-    1. If _undersized_ is neither *"only full"* nor *"allow partial"*, then
+    1. If _undersized_ is *undefined*, set _undersized_ to *"only-full"*.
+    1. If _undersized_ is neither *"only-full"* nor *"allow-partial"*, then
       1. Let _error_ be ThrowCompletion(a newly created *TypeError* object).
       1. Return ? IteratorClose(_iterated_, _error_).
     1. Set _iterated_ to ? GetIteratorDirect(_O_).
@@ -59,7 +59,7 @@ copyright: false
       1. Repeat,
         1. Let _value_ be ? IteratorStepValue(_iterated_).
         1. If _value_ is ~done~, then
-          1. If _undersized_ is *"allow partial"*, _buffer_ is not empty, and the number of elements in _buffer_ &lt; ℝ(_windowSize_), then
+          1. If _undersized_ is *"allow-partial"*, _buffer_ is not empty, and the number of elements in _buffer_ &lt; ℝ(_windowSize_), then
             1. Perform Completion(Yield(CreateArrayFromList(_buffer_))).
           1. Return ReturnCompletion(*undefined*).
         1. If the number of elements in _buffer_ is ℝ(_windowSize_), then
diff --git a/src/index.ts b/src/index.ts
index 79a898e..47ffc77 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -31,7 +31,7 @@ function chunks(this: unknown, chunkSize: unknown): Generator<unknown> {
   return chunksImpl(this as Iterator<unknown>, chunkSize)
 }
 
-function* windowsImpl<A>(iter: Iterator<A>, windowSize: number, undersized: 'only full' | 'allow partial'): Generator<Array<A>> {
+function* windowsImpl<A>(iter: Iterator<A>, windowSize: number, undersized: 'only-full' | 'allow-partial'): Generator<Array<A>> {
   let buffer = [];
   for (const elem of liftIterator(iter)) {
     if (buffer.length === windowSize) {
@@ -42,12 +42,12 @@ function* windowsImpl<A>(iter: Iterator<A>, windowSize: number, undersized: 'onl
       yield buffer.slice();
     }
   }
-  if (undersized === 'allow partial' && 0 < buffer.length && buffer.length < windowSize) {
+  if (undersized === 'allow-partial' && 0 < buffer.length && buffer.length < windowSize) {
     yield buffer;
   }
 }
 
-function windows<A>(this: Iterator<A>, windowSize: number, undersized?: 'only full' | 'allow partial'): Generator<Array<A>>
+function windows<A>(this: Iterator<A>, windowSize: number, undersized?: 'only-full' | 'allow-partial'): Generator<Array<A>>
 function windows(this: unknown, windowSize: unknown, undersized?: unknown): Generator<unknown> {
   if (
     typeof windowSize !== 'number'
@@ -58,9 +58,9 @@ function windows(this: unknown, windowSize: unknown, undersized?: unknown): Gene
     throw new RangeError;
   }
   if (undersized === undefined) {
-    undersized = 'only full';
+    undersized = 'only-full';
   }
-  if (undersized !== 'only full' && undersized !== 'allow partial') {
+  if (undersized !== 'only-full' && undersized !== 'allow-partial') {
     throw new TypeError;
   }
   return windowsImpl(this as Iterator<unknown>, windowSize, undersized);
diff --git a/test/index.mjs b/test/index.mjs
index 285656a..5688e8b 100644
--- a/test/index.mjs
+++ b/test/index.mjs
@@ -66,11 +66,11 @@ test('windows', async t => {
     [[0, 1], [1, 2], [2, 3], [3, 4]],
   );
   assert.deepEqual(
-    Array.from(nats(5).windows(2, "only full")),
+    Array.from(nats(5).windows(2, "only-full")),
     [[0, 1], [1, 2], [2, 3], [3, 4]],
   );
   assert.deepEqual(
-    Array.from(nats(5).windows(2, "allow partial")),
+    Array.from(nats(5).windows(2, "allow-partial")),
     [[0, 1], [1, 2], [2, 3], [3, 4]],
   );
 
@@ -83,11 +83,11 @@ test('windows', async t => {
     [[0], [1], [2], [3], [4]],
   );
   assert.deepEqual(
-    Array.from(nats(5).windows(1, "only full")),
+    Array.from(nats(5).windows(1, "only-full")),
     [[0], [1], [2], [3], [4]],
   );
   assert.deepEqual(
-    Array.from(nats(5).windows(1, "allow partial")),
+    Array.from(nats(5).windows(1, "allow-partial")),
     [[0], [1], [2], [3], [4]],
   );
 
@@ -100,11 +100,11 @@ test('windows', async t => {
     [[0, 1, 2], [1, 2, 3], [2, 3, 4], [3, 4, 5]],
   );
   assert.deepEqual(
-    Array.from(nats(6).windows(3, "only full")),
+    Array.from(nats(6).windows(3, "only-full")),
     [[0, 1, 2], [1, 2, 3], [2, 3, 4], [3, 4, 5]],
   );
   assert.deepEqual(
-    Array.from(nats(6).windows(3, "allow partial")),
+    Array.from(nats(6).windows(3, "allow-partial")),
     [[0, 1, 2], [1, 2, 3], [2, 3, 4], [3, 4, 5]],
   );
 
@@ -117,11 +117,11 @@ test('windows', async t => {
     [],
   );
   assert.deepEqual(
-    Array.from(nats(6).windows(100, "only full")),
+    Array.from(nats(6).windows(100, "only-full")),
     [],
   );
   assert.deepEqual(
-    Array.from(nats(6).windows(100, "allow partial")),
+    Array.from(nats(6).windows(100, "allow-partial")),
     [[0, 1, 2, 3, 4, 5]],
   );
 
@@ -134,11 +134,11 @@ test('windows', async t => {
     [],
   );
   assert.deepEqual(
-    Array.from(nats(0).windows(2, "only full")),
+    Array.from(nats(0).windows(2, "only-full")),
     [],
   );
   assert.deepEqual(
-    Array.from(nats(0).windows(2, "allow partial")),
+    Array.from(nats(0).windows(2, "allow-partial")),
     [],
   );
 
@@ -146,20 +146,20 @@ test('windows', async t => {
     nats(1).windows()
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(undefined, "only full")
+    nats(1).windows(undefined, "only-full")
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(undefined, "allow partial")
+    nats(1).windows(undefined, "allow-partial")
   }, RangeError);
 
   assert.throws(() => {
     nats(1).windows([2]);
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows([2], "only full");
+    nats(1).windows([2], "only-full");
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows([2], "allow partial");
+    nats(1).windows([2], "allow-partial");
   }, RangeError);
 
   assert.throws(() => {
@@ -169,10 +169,10 @@ test('windows', async t => {
     nats(1).windows(0, undefined);
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(0, "only full");
+    nats(1).windows(0, "only-full");
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(0, "allow partial");
+    nats(1).windows(0, "allow-partial");
   }, RangeError);
 
   assert.throws(() => {
@@ -182,10 +182,10 @@ test('windows', async t => {
     nats(1).windows(-1, undefined);
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(-1, "only full");
+    nats(1).windows(-1, "only-full");
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(-1, "allow partial");
+    nats(1).windows(-1, "allow-partial");
   }, RangeError);
 
   assert.throws(() => {
@@ -195,10 +195,10 @@ test('windows', async t => {
     nats(1).windows(1.5, undefined);
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(1.5, "only full");
+    nats(1).windows(1.5, "only-full");
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(1.5, "allow partial");
+    nats(1).windows(1.5, "allow-partial");
   }, RangeError);
 
   assert.throws(() => {
@@ -208,10 +208,10 @@ test('windows', async t => {
     nats(1).windows(Math.pow(2, 53), undefined);
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(Math.pow(2, 53), "only full");
+    nats(1).windows(Math.pow(2, 53), "only-full");
   }, RangeError);
   assert.throws(() => {
-    nats(1).windows(Math.pow(2, 53), "allow partial");
+    nats(1).windows(Math.pow(2, 53), "allow-partial");
   }, RangeError);
 
   assert.throws(() => {