[Google Maps API v3] wrong decimals in google.maps.LatLng ?

[bgacias]

I'm loading  the Google Maps JavaScript V3 using:

 script.src = "http://maps.google.com/maps/api/js?
v=3&sensor=false&region=ES";



in my  javaScript I have these lines:

    var lat = parseFloat("39.5775");
    var lng = parseFloat("2.714105");
    alert("parseLatLng" + new google.maps.LatLng(lat, lng));
    alert("parseLatLng with 10 decimals " + new
google.maps.LatLng(lat, lng).toUrlValue(10));

the firs alert shows :
parseLatLng(39.5775, 2.7141050000000178)

and the second shows:
parseLatLng with 10 decimals 39.5775,2.714105

Why the longitude of the LatLng object is 2.7141050000000178 and not
2.714105?

Thanks in advance

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