"roundtrip of ‘data'" mixed test case fails

[tomduncalf]

When running the mixed.ts tests, the test for "roundtrip of 'data'" is failing:

[mocha]       AssertionError: expected [ 0, 0, 0, 0 ] to deeply equal [ 4, 8, 12, 16 ]
[mocha]       + expected - actual
[mocha]
[mocha]        [
[mocha]       -  0
[mocha]       -  0
[mocha]       -  0
[mocha]       -  0
[mocha]       +  4
[mocha]       +  8
[mocha]       +  12
[mocha]       +  16
[mocha]        ]
[mocha]

and on another run...

[mocha]       AssertionError: expected [ 43, 121, 236, 62 ] to deeply equal [ 4, 8, 12, 16 ]
[mocha]       + expected - actual
[mocha]
[mocha]        [
[mocha]       -  43
[mocha]       -  121
[mocha]       -  236
[mocha]       -  62
[mocha]       +  4
[mocha]       +  8
[mocha]       +  12
[mocha]       +  16
[mocha]        ]

This looks like it could be a memory corruption bug similar to previous issues found with the mixed data type.