Currency field referenced as float shows currency symbol

Frappe Framework
1

Hi All, Can any one please explain me the reason of formatting float field as currency when referenced by options? I am talking about the below code. Thanks

Float: function(value, docfield, options, doc) {
	// don't allow 0 precision for Floats, hence or'ing with null
	var precision = docfield.precision || cint(frappe.boot.sysdefaults.float_precision) || null;
	if (docfield.options && docfield.options.trim()) {
		// options points to a currency field, but expects precision of float!
		docfield.precision = precision;
		return frappe.form.formatters.Currency(value, docfield, options, doc);

	} else {
		// show 1.000000 as 1
		if (!(options || {}).always_show_decimals && !is_null(value)) {
			var temp = cstr(value).split(".");
			if (temp[1]==undefined || cint(temp[1])===0) {
				precision = 0;
			}
		}

		return frappe.form.formatters._right(
			((value==null || value==="")
				? ""
				: format_number(value, null, precision)), options);
	}
}