From 154dd363e181e1eb33d6575783ec0528ccb01eaa Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Fri, 8 Aug 2025 11:11:17 -0700
Subject: [PATCH] Fix fractional raw handling and allow zero amounts.

---
 src/lib/tools.ts | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/src/lib/tools.ts b/src/lib/tools.ts
index a239994..ea597ea 100644
--- a/src/lib/tools.ts
+++ b/src/lib/tools.ts
@@ -50,26 +50,28 @@ export function convert (amount: unknown, inputUnit: unknown, outputUnit: unknow
 	let [i, f] = typeof amount === 'string'
 		? amount.split('.')
 		: amount.toString().split('.')
+	i = i.replace(/^0*/g, '')
+	f = f?.replace(/0*$/g, '')
 
-	// convert to raw
 	const inUnit = UNITS[inputUnit.toUpperCase()]
-	i = i.padEnd(i.length + inUnit, '0')
-	let int = BigInt(i)
+	const intShift = i.length + inUnit
+	if (f?.length > inUnit) {
+		throw new RangeError('Amount contains fractional raw')
+	}
+
+	// convert to raw
+	let int = BigInt(i.padEnd(intShift, '0') || '0')
 	if (f != null) {
-		f = f.padEnd(f.length + inUnit, '0')
-		let frac = BigInt(f)
-		const remainder = frac % (10n ** BigInt(inUnit))
-		if (remainder > 0n) {
-			throw new Error('Amount contains fractional raw', { cause: remainder })
-		}
-		frac /= 10n ** BigInt(f.length - inUnit)
+		const fracShift = f?.length + inUnit
+		let frac = BigInt(f?.padEnd(fracShift, '0') || '0')
+		frac /= 10n ** BigInt(f.length)
 		int += frac
 	}
 	if (int > MAX_SUPPLY) {
 		throw new Error('Amount exceeds available supply')
 	}
-	if (int < 1n) {
-		throw new Error('Amount must be at least 1 raw')
+	if (int < 0n) {
+		throw new Error('Amount must be non-negative')
 	}
 	if (format === 'bigint') {
 		return int
-- 
2.47.3