[Fix] Empty prefix causes weird behaviour

Author: dipaksarkar

src/number-format.ts

@@ -33,6 +33,7 @@ export default class NumberFormat {
   input: Input
   number: Input
   isClean: boolean
+  isCustomDecimal: boolean
   preSurRegExp: RegExp
   numberRegExp: RegExp
   cleanRegExp: RegExp
@@ -53,6 +54,7 @@ export default class NumberFormat {
     this.numberRegExp = new RegExp(`[^0-9\\${decimal}]+`, 'gi')
     this.cleanRegExp = new RegExp('[^0-9]+', 'gi')
     this.negativeRegExp = new RegExp('[^0-9\\-]+', 'gi')
+    this.isCustomDecimal = decimal !== '.'
   }
 
   isNull() {
@@ -98,15 +100,19 @@ export default class NumberFormat {
 
   numbers() {
     const { reverseFill, decimal } = this.options
+    const hasDeciaml = this.input.toString().indexOf(decimal) >= 0
+    const input = !hasDeciaml && this.isCustomDecimal ? this.input + decimal : this.input
+
     if (reverseFill) {
       this.number = this.toFixed().replace('.', decimal)
     } else if (typeof this.input === 'number') {
       this.number = this.parts(this.input.toString().replace('-', ''), '.').join(decimal)
-    } else if (!isNaN(this.toNumber(this.input))) {
+    } else if (!isNaN(this.toNumber(input))) {
       this.number = this.parts(this.input.replace('-', ''), '.').join(decimal)
     } else {
       this.number = this.parts(this.numberOnly()).join(decimal)
     }
+
     return this.number
   }