Javascript - number conversion

Javascript have three functions for converting nonnumberic value to numbers:
- Number();
- parseInt();
- parseFloat();

Empty string:

Number("") = 0 
parseInt("") = NaN 
parseFloat("") = NaN 

Parsing with first lending a letter:

Number("a1") = NaN 
parseInt("a1") = NaN 
parseFloat("a1") = NaN 

Parsing with first lending 1 number:

Number("1a") = NaN 
parseInt("1a") = 1 
parseFloat("1a") = 1 

Parsing hexadecimal (10):

Number("0xA") = 10 
parseInt("0xA") = 10 
parseFloat("0xA") = 0 

Lending zeros are ignored:

parseFloat("001") = 1 
parseInt("001") = 1 
Number("001") = 1 

Parsing floating numbers with lending zeros:

parseFloat("00.1") = 0.1 
parseInt("00.1") = 0 
Number("00.1") = 0.1 

Parsing floating numbers without lending zeros:

parseFloat("0.1") = 0.1 
parseInt("0.1") = 0 
Number("0.1") = 0.1 

Parsing booleans:

Number(true) = 1 
Number(false) = 0 
parseFloat(true) = NaN 
parseFloat(false) = NaN 
parseInt(true) = NaN 
parseInt(false) = NaN 

Parsing null:

Number(null) = 0 
parseFloat(null) = NaN 
parseInt(null) = NaN 

Parsing undefined:

Number(undefined) = NaN 
parseFloat(undefined) = NaN 
parseInt(undefined) = NaN 

Parsing NaN:

Number(NaN) = NaN 
parseFloat(NaN) = NaN 
parseInt(NaN) = NaN 

Parsing positive negative floating numbers:

parseFloat("+1.1") = 1.1 
parseFloat("-1.1") = -1.1 
parseInt("+1.1") = 1 
parseInt("-1.1") = -1 
Number("+1.1") = 1.1 
Number("-1.1") = -1.1 

Wightespace is ignored:

parseInt(" +1") = 1 
parseInt(" -1") = -1 
parseFloat(" +1") = 1 
parseFloat(" -1") = -1 
Number(" +1") = 1 
Number(" -1") = -1 

parseInt suport radix or base:

parseInt("10",2) = 2 //binary
parseInt("10",8) = 8  //octal
parseInt("10",10) = 10 //decimal
parseInt("10",16) = 16 //hexadecimal

All test cases are hire:
http://jsfiddle.net/zbL7H/3/