The spec grammar for `HexIntegerLiteral` is as follows:
http://es5.github.com/x7.html#x7.8.3
HexIntegerLiteral ::
0x HexDigit
0X HexDigit
HexIntegerLiteral HexDigit
HexDigit :: one of
0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F
Note that no `ExponentPart` seems to be allowed here.
However, a lot of engines seem to support exponents after hex integer literals:
255; // 255
0xFF; // 255
255e2; // 25500
0xFFe2; // 65506
I couldn’t find this in the spec though. Is this defined anywhere? Is
this expected behavior or not?
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