In squeak 5.3, building ByteArrays from HEX strings are now failing, 
after years of passing within the Cryptography tests.

The first doIt works, while the other two are now failing in the 
#readHexFrom: method...
PASSING
ByteArray fromHexString: '06a9214036b8a15b512e03d534120006'

FAILING
ByteArray fromHexString: '16rc286696d887c9aa0611bbb3e2025a45a'
ByteArray fromHexString: '00000000 00000000'

This is causing multiple test failures in the Cryptography test suite.

tyk, r