Patch formatjs BigDecimal to stop dividing by 1 on every number format (#11610)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

patches/@formatjs__bigdecimal@0.2.5.patch

@@ -0,0 +1,30 @@
+diff --git a/index.js b/index.js
+index 12101e1b954e1a8c7bf7887bef4f4e08fb06a8be..51d7af352a8a222c5320426f376d51c5a173300b 100644
+--- a/index.js
++++ b/index.js
+@@ -170,6 +170,13 @@ var BigDecimal = class BigDecimal {
+ 	times(y) {
+ 		const other = BigDecimal._coerce(y);
+ 		if (this._special || other._special) return this._specialArith(other, "times");
++		// Fast path: multiplying by exactly 1 is an identity operation. ECMA-402's
++		// ToRawFixed multiplies by roundingIncrement, which defaults to 1, on every
++		// format call - without this check that is a full BigInt multiply followed
++		// by a trailing-zero strip. BigDecimal is immutable, so returning the
++		// existing instance is safe.
++		if (other._mantissa === 1n && other._exponent === 0) return this;
++		if (this._mantissa === 1n && this._exponent === 0) return other;
+ 		if (this._mantissa === 0n || other._mantissa === 0n) {
+ 			const negZero = this._isSignNegative() ? !other._isSignNegative() : other._isSignNegative();
+ 			return BigDecimal._create(0n, 0, SpecialValue.NONE, negZero);
+@@ -189,6 +196,11 @@ var BigDecimal = class BigDecimal {
+ 			const negZero = this._isSignNegative() !== other._isSignNegative();
+ 			return BigDecimal._create(0n, 0, SpecialValue.NONE, negZero);
+ 		}
++		// Fast path: dividing by exactly 1 is an identity operation. ECMA-402's
++		// ToRawFixed divides by roundingIncrement, which defaults to 1, on every
++		// format call - without this check that is a 10^DIV_PRECISION BigInt
++		// scale-up, a division, and a trailing-zero strip that undoes the scaling.
++		if (other._mantissa === 1n && other._exponent === 0) return this;
+ 		const [nm, ne] = removeTrailingZeros(this._mantissa * bigintPow10(DIV_PRECISION) / other._mantissa, this._exponent - other._exponent - DIV_PRECISION);
+ 		return BigDecimal._create(nm, ne, SpecialValue.NONE, false);
+ 	}

pnpm-lock.yaml

@@ -217,6 +217,7 @@ overrides:
 packageExtensionsChecksum: sha256-KbeCj471Qk3TA758q8nLPkiGCPDA0TX18iO/Coy89lo=
 
 patchedDependencies:
+  '@formatjs/bigdecimal@0.2.5': 53afe18a845c1469b8b9002a460582559dfd52f502bc66a0f4c05662c2619291
   '@sentry/expo-upload-sourcemaps@8.18.0': 2368e1e1986165e7ead3c60017b78b2f9ade1b6a6b2f5ad27cd428608c6f12ae
   expo-age-range@57.0.2: c325225749993424461eeece1d97a99b19c00da2ebc958a73c12e4eca0c39306
   expo-haptics@57.0.1: b33910ba2753c4eccdc885b449e6e33aa90b9cefa75ca8639762a26013141410
@@ -11345,7 +11346,7 @@ snapshots:
 
   '@floating-ui/utils@0.2.11': {}
 
-  '@formatjs/bigdecimal@0.2.5': {}
+  '@formatjs/bigdecimal@0.2.5(patch_hash=53afe18a845c1469b8b9002a460582559dfd52f502bc66a0f4c05662c2619291)': {}
 
   '@formatjs/fast-memoize@3.1.5': {}
 
@@ -11366,12 +11367,12 @@ snapshots:
 
   '@formatjs/intl-numberformat@9.3.10':
     dependencies:
-      '@formatjs/bigdecimal': 0.2.5
+      '@formatjs/bigdecimal': 0.2.5(patch_hash=53afe18a845c1469b8b9002a460582559dfd52f502bc66a0f4c05662c2619291)
       '@formatjs/intl-localematcher': 0.8.9
 
   '@formatjs/intl-pluralrules@6.3.9':
     dependencies:
-      '@formatjs/bigdecimal': 0.2.5
+      '@formatjs/bigdecimal': 0.2.5(patch_hash=53afe18a845c1469b8b9002a460582559dfd52f502bc66a0f4c05662c2619291)
       '@formatjs/intl-localematcher': 0.8.9
 
   '@formatjs/intl-supportedvaluesof@2.3.7':

pnpm-workspace.yaml

@@ -29,6 +29,7 @@ allowBuilds:
   'esbuild': false
   'unrs-resolver': true
 patchedDependencies:
+  '@formatjs/bigdecimal@0.2.5': patches/@formatjs__bigdecimal@0.2.5.patch
   '@sentry/expo-upload-sourcemaps@8.18.0': patches/@sentry__expo-upload-sourcemaps@8.18.0.patch
   'expo-age-range@57.0.2': patches/expo-age-range@57.0.2.patch
   'expo-haptics@57.0.1': patches/expo-haptics@57.0.1.patch