Shorten array by changing the length does not shorten the array in Espruino

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MaBe

Tested code in Emulator

a = [0,1,2,3,4]
//=[ 0, 1, 2, 3, 4 ]
a.length
//=5
a.length = 3
//=3
a
=[ 0, 1, 2, 3, 4, length: 3 ]
// should return >a = [0,1,2]

Tested code in Google Chrome

a = [0,1,2,3,4]
//(5) [0, 1, 2, 3, 4]
a.length
//5
a.length = 3
//3
a
//(3) [0, 1, 2]

Workaround in Espruino

a = [0,1,2,3,4]
//=[ 0, 1, 2, 3, 4 ]
a = a.slice(0,3)
//=[ 0, 1, 2 ]
a.length
//=3