diff --git a/src/uix/morfo/compile.ts b/src/uix/morfo/compile.ts
index 5fe3cc83a..04d341571 100644
--- a/src/uix/morfo/compile.ts
+++ b/src/uix/morfo/compile.ts
@@ -522,7 +522,8 @@ function compileDataPlan(data: MorfoData, componentKebab: string): AttrPlan {
 function compileAriaPlan(aria: MorfoAriaEntry, componentKebab: string): AttrPlan {
 	const condition: ConditionPlan = aria.condition ?? 'always'
 	const source = normalizeSource(aria.value, componentKebab)
-	const mode: AttrMode = aria.value.kind === 'stateRef' ? 'aria-boolean' : 'string'
+	const mode: AttrMode =
+		aria.value.kind === 'stateRef' || aria.ariaBoolean ? 'aria-boolean' : 'string'
 	return Object.freeze({
 		attr: aria.attr,
 		source,
diff --git a/src/uix/morfo/components/number-field.ts b/src/uix/morfo/components/number-field.ts
index cd9dcb826..5691063b6 100644
--- a/src/uix/morfo/components/number-field.ts
+++ b/src/uix/morfo/components/number-field.ts
@@ -92,10 +92,30 @@ export const numberFieldMorfo = {
 					condition: { when: 'prop-defined', prop: 'max' }
 				},
 				{ attr: 'aria-valuetext', value: v.propRef('value'), severity: 'recommended' },
-				{ attr: 'aria-required', value: v.propRef('required'), severity: 'optional' },
-				{ attr: 'aria-disabled', value: v.propRef('disabled'), severity: 'optional' },
-				{ attr: 'aria-readonly', value: v.propRef('readonly'), severity: 'optional' },
-				{ attr: 'aria-invalid', value: v.propRef('invalid'), severity: 'optional' }
+				{
+					attr: 'aria-required',
+					value: v.propRef('required'),
+					severity: 'optional',
+					ariaBoolean: true
+				},
+				{
+					attr: 'aria-disabled',
+					value: v.propRef('disabled'),
+					severity: 'optional',
+					ariaBoolean: true
+				},
+				{
+					attr: 'aria-readonly',
+					value: v.propRef('readonly'),
+					severity: 'optional',
+					ariaBoolean: true
+				},
+				{
+					attr: 'aria-invalid',
+					value: v.propRef('invalid'),
+					severity: 'optional',
+					ariaBoolean: true
+				}
 			],
 			keyboard: [
 				{ key: 'ArrowUp', action: 'increment' },
diff --git a/src/uix/morfo/schema.ts b/src/uix/morfo/schema.ts
index 946e2da0e..d8f9fb573 100644
--- a/src/uix/morfo/schema.ts
+++ b/src/uix/morfo/schema.ts
@@ -165,7 +165,8 @@ const ariaEntrySchema = object({
 	attr: string(),
 	value: valueSourceSchema,
 	condition: optional(conditionSchema),
-	severity: optional(severitySchema)
+	severity: optional(severitySchema),
+	ariaBoolean: optional(boolean())
 });
 
 const keyboardSchema = object({
diff --git a/src/uix/morfo/types.ts b/src/uix/morfo/types.ts
index 838a2d230..4c9976ab2 100644
--- a/src/uix/morfo/types.ts
+++ b/src/uix/morfo/types.ts
@@ -264,6 +264,13 @@ export interface MorfoAriaEntry {
 	condition?: MorfoCondition;
 	/** Validator severity. Defaults to `'required'`. */
 	severity?: MorfoSeverity;
+	/**
+	 * Render the value as an ARIA boolean (`"true"`/`"false"` string) instead of
+	 * passing it through raw. A `stateRef` value already compiles to aria-boolean;
+	 * set this for a `propRef` boolean (e.g. `aria-required` ← `required` prop) so
+	 * `renderProps()` stringifies it and the provider need not re-declare it.
+	 */
+	ariaBoolean?: boolean;
 }
 
 // ── Keyboard ──────────────────────────────────────────────────────────────
diff --git a/src/uix/soma/components/number-field/number-field-provider.svelte.ts b/src/uix/soma/components/number-field/number-field-provider.svelte.ts
index 4764c1cfe..cde5fa552 100644
--- a/src/uix/soma/components/number-field/number-field-provider.svelte.ts
+++ b/src/uix/soma/components/number-field/number-field-provider.svelte.ts
@@ -617,15 +617,6 @@ export class NumberFieldInputProvider {
 				this.provider.opts.value.current !== undefined
 					? this.provider.formatValue(this.provider.opts.value.current)
 					: undefined,
-			// ARIA booleans: the morfo declares them (propRef), but a propRef-valued
-			// aria attr compiles to raw mode → renderProps emits the boolean. ARIA
-			// wants the "true"/"false" string, so soma stringifies (same role as the
-			// formatted aria-valuetext above). A future `v.ariaBool()` morfo helper
-			// would let these resolve from the morfo too.
-			'aria-required': boolToStr(this.provider.isRequired),
-			'aria-disabled': boolToStr(this.provider.isDisabled),
-			'aria-readonly': boolToStr(this.provider.isReadonly),
-			'aria-invalid': boolToStr(this.provider.isInvalid),
 			'aria-describedby': this.describedBy,
 			disabled: this.provider.isDisabled || undefined,
 			readonly: this.provider.isReadonly || undefined,