toAscii method
Converts the negative Unicode representation of this String to ASCII.
Example:
'1'.toAscii() == '1'
'−5'.toAscii() == '-5'
Implementation
// ignore: unnecessary_this for improved code formatting.
String toAscii() => this
.replaceFirst(NumExtension.minusSign, '-')
.replaceFirst(NumExtension.plusMinusSign, '+');