_isDecimalCharacterInsertionAllowed() {
        return String(this.settings.decimalPlacesShownOnFocus) !== String(AutoNumeric.options.decimalPlacesShownOnFocus.none) &&
            String(this.settings.decimalPlaces) !== String(AutoNumeric.options.decimalPlaces.none);
    }
Return `true` if a decimal character is allowed to be typed.
If the number of decimal places shown on focus is zero, then the decimal character is not allowed.

@returns {boolean}
@private