diff --git a/src/uix/morfo/components/color-picker.ts b/src/uix/morfo/components/color-picker.ts
index 9c1860757..3d5d9d896 100644
--- a/src/uix/morfo/components/color-picker.ts
+++ b/src/uix/morfo/components/color-picker.ts
@@ -31,66 +31,24 @@ export const colorPickerMorfo = {
 			}
 		},
 		{
-			name: 'close-commit',
-			semantic: {
-				family: 'commit',
-				verb: 'save',
-				target: v.partRef('content'),
-				sequence: 'post',
-				intent: 'fulfill'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('content'), attr: 'data-last-action', value: 'committed' }],
-			commits: {
-				part: v.partRef('content'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-cancel',
+			// Polymorphic close (book §5.3) — mirror of Dialog / Drawer /
+			// Popover. Provider-set `data-last-action` ('committed' /
+			// 'cancelled' / 'dismissed' / 'dismissed-outside') discriminates
+			// the cause; the picker shell's commit/cancel/clear handle uses
+			// `runtime.trigger('close', { semantic })` if it ever fires
+			// these events (today the provider just sets `opts.open =
+			// false` and lets the popover unmount). Persistence transient —
+			// the popover disappears.
+			name: 'close',
 			semantic: {
 				family: 'emerge',
 				verb: 'close',
 				target: v.partRef('content'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('content'), attr: 'data-last-action', value: 'cancelled' }],
-			commits: {
-				part: v.partRef('content'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-dismiss',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('content'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('content'), attr: 'data-last-action', value: 'dismissed' }],
-			commits: {
-				part: v.partRef('content'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-dismiss-outside',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('content'),
-				sequence: 'pre'
+				sequence: 'pre',
+				persistence: 'transient',
+				allowedFamilies: ['emerge', 'commit', 'signal']
 			},
 			regime: 'lock',
-			prewrite: [
-				{ part: v.partRef('content'), attr: 'data-last-action', value: 'dismissed-outside' }
-			],
 			commits: {
 				part: v.partRef('content'),
 				attr: 'data-state',
diff --git a/src/uix/morfo/components/date-picker.ts b/src/uix/morfo/components/date-picker.ts
index e6cbe5432..ee0c93b2b 100644
--- a/src/uix/morfo/components/date-picker.ts
+++ b/src/uix/morfo/components/date-picker.ts
@@ -40,75 +40,23 @@ export const datePickerMorfo = {
 			}
 		},
 		{
-			// The user committed a date and the popover closed.
-			// `fulfill` because the picker's job — pick a date — is done.
-			name: 'close-commit',
-			semantic: {
-				family: 'commit',
-				verb: 'save',
-				target: v.partRef('calendar'),
-				sequence: 'post',
-				intent: 'fulfill'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('calendar'), attr: 'data-last-action', value: 'committed' }],
-			commits: {
-				part: v.partRef('calendar'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			// Explicit cancel from a Save/Cancel button (modal mode).
-			name: 'close-cancel',
+			// Polymorphic close (book §5.3) — mirror of color-picker /
+			// dialog. Provider-set `data-last-action` ('committed' /
+			// 'cancelled' / 'dismissed' / 'dismissed-outside') discriminates
+			// the cause. Today's date-picker provider just toggles
+			// `opts.open`; if it ever explicitly calls
+			// `runtime.trigger('close', { semantic })`, the polymorphic
+			// shape is ready.
+			name: 'close',
 			semantic: {
 				family: 'emerge',
 				verb: 'close',
 				target: v.partRef('calendar'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('calendar'), attr: 'data-last-action', value: 'cancelled' }],
-			commits: {
-				part: v.partRef('calendar'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			// Escape key.
-			name: 'close-dismiss',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('calendar'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('calendar'), attr: 'data-last-action', value: 'dismissed' }],
-			commits: {
-				part: v.partRef('calendar'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			// Click outside the popover.
-			name: 'close-dismiss-outside',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('calendar'),
-				sequence: 'pre'
+				sequence: 'pre',
+				persistence: 'transient',
+				allowedFamilies: ['emerge', 'commit', 'signal']
 			},
 			regime: 'lock',
-			prewrite: [
-				{
-					part: v.partRef('calendar'),
-					attr: 'data-last-action',
-					value: 'dismissed-outside'
-				}
-			],
 			commits: {
 				part: v.partRef('calendar'),
 				attr: 'data-state',
diff --git a/src/uix/morfo/components/date-range-picker.ts b/src/uix/morfo/components/date-range-picker.ts
index 9d8d20ae0..f8103338a 100644
--- a/src/uix/morfo/components/date-range-picker.ts
+++ b/src/uix/morfo/components/date-range-picker.ts
@@ -40,81 +40,20 @@ export const dateRangePickerMorfo = {
 			}
 		},
 		{
-			// The user committed a complete range and the popover closed.
-			// `fulfill` because the picker's job — pick a complete range — is done.
-			name: 'close-range-commit',
-			semantic: {
-				family: 'commit',
-				verb: 'save',
-				target: v.partRef('calendar'),
-				sequence: 'post',
-				intent: 'fulfill'
-			},
-			regime: 'lock',
-			prewrite: [
-				{ part: v.partRef('calendar'), attr: 'data-last-action', value: 'range-committed' }
-			],
-			commits: {
-				part: v.partRef('calendar'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			// Explicit cancel from a Save/Cancel button (modal mode).
-			name: 'close-cancel',
+			// Polymorphic close (book §5.3). Provider-set `data-last-action`
+			// values: 'range-committed' (Save when range complete) /
+			// 'cancelled' (Cancel button) / 'dismissed' (Escape) /
+			// 'dismissed-outside' (click outside).
+			name: 'close',
 			semantic: {
 				family: 'emerge',
 				verb: 'close',
 				target: v.partRef('calendar'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [
-				{ part: v.partRef('calendar'), attr: 'data-last-action', value: 'cancelled' }
-			],
-			commits: {
-				part: v.partRef('calendar'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			// Escape key.
-			name: 'close-dismiss',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('calendar'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [
-				{ part: v.partRef('calendar'), attr: 'data-last-action', value: 'dismissed' }
-			],
-			commits: {
-				part: v.partRef('calendar'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			// Click outside the popover.
-			name: 'close-dismiss-outside',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('calendar'),
-				sequence: 'pre'
+				sequence: 'pre',
+				persistence: 'transient',
+				allowedFamilies: ['emerge', 'commit', 'signal']
 			},
 			regime: 'lock',
-			prewrite: [
-				{
-					part: v.partRef('calendar'),
-					attr: 'data-last-action',
-					value: 'dismissed-outside'
-				}
-			],
 			commits: {
 				part: v.partRef('calendar'),
 				attr: 'data-state',
diff --git a/src/uix/morfo/components/time-picker.ts b/src/uix/morfo/components/time-picker.ts
index de07139fe..517a11917 100644
--- a/src/uix/morfo/components/time-picker.ts
+++ b/src/uix/morfo/components/time-picker.ts
@@ -49,70 +49,19 @@ export const timePickerMorfo = {
 			}
 		},
 		{
-			name: 'close-commit',
-			semantic: {
-				family: 'commit',
-				verb: 'save',
-				target: v.partRef('clock'),
-				sequence: 'post',
-				intent: 'fulfill'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('clock'), attr: 'data-last-action', value: 'committed' }],
-			commits: {
-				part: v.partRef('clock'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-cancel',
+			// Polymorphic close (book §5.3). Provider-set `data-last-action`
+			// ('committed' / 'cancelled' / 'dismissed' / 'dismissed-outside')
+			// discriminates the cause.
+			name: 'close',
 			semantic: {
 				family: 'emerge',
 				verb: 'close',
 				target: v.partRef('clock'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('clock'), attr: 'data-last-action', value: 'cancelled' }],
-			commits: {
-				part: v.partRef('clock'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-dismiss',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('clock'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('clock'), attr: 'data-last-action', value: 'dismissed' }],
-			commits: {
-				part: v.partRef('clock'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-dismiss-outside',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('clock'),
-				sequence: 'pre'
+				sequence: 'pre',
+				persistence: 'transient',
+				allowedFamilies: ['emerge', 'commit', 'signal']
 			},
 			regime: 'lock',
-			prewrite: [
-				{
-					part: v.partRef('clock'),
-					attr: 'data-last-action',
-					value: 'dismissed-outside'
-				}
-			],
 			commits: {
 				part: v.partRef('clock'),
 				attr: 'data-state',
diff --git a/src/uix/morfo/components/time-range-picker.ts b/src/uix/morfo/components/time-range-picker.ts
index c6fe97299..66934c826 100644
--- a/src/uix/morfo/components/time-range-picker.ts
+++ b/src/uix/morfo/components/time-range-picker.ts
@@ -50,70 +50,18 @@ export const timeRangePickerMorfo = {
 			}
 		},
 		{
-			name: 'close-commit',
-			semantic: {
-				family: 'commit',
-				verb: 'save',
-				target: v.partRef('clock'),
-				sequence: 'post',
-				intent: 'fulfill'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('clock'), attr: 'data-last-action', value: 'committed' }],
-			commits: {
-				part: v.partRef('clock'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-cancel',
+			// Polymorphic close (book §5.3). Provider-set `data-last-action`
+			// ('committed' / 'cancelled' / 'dismissed' / 'dismissed-outside').
+			name: 'close',
 			semantic: {
 				family: 'emerge',
 				verb: 'close',
 				target: v.partRef('clock'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('clock'), attr: 'data-last-action', value: 'cancelled' }],
-			commits: {
-				part: v.partRef('clock'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-dismiss',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('clock'),
-				sequence: 'pre'
-			},
-			regime: 'lock',
-			prewrite: [{ part: v.partRef('clock'), attr: 'data-last-action', value: 'dismissed' }],
-			commits: {
-				part: v.partRef('clock'),
-				attr: 'data-state',
-				value: 'closed'
-			}
-		},
-		{
-			name: 'close-dismiss-outside',
-			semantic: {
-				family: 'emerge',
-				verb: 'dismiss',
-				target: v.partRef('clock'),
-				sequence: 'pre'
+				sequence: 'pre',
+				persistence: 'transient',
+				allowedFamilies: ['emerge', 'commit', 'signal']
 			},
 			regime: 'lock',
-			prewrite: [
-				{
-					part: v.partRef('clock'),
-					attr: 'data-last-action',
-					value: 'dismissed-outside'
-				}
-			],
 			commits: {
 				part: v.partRef('clock'),
 				attr: 'data-state',