uint64 typecast can't be initialised with more than 15 decimal positions

[Yury T.]

In theory, uint64 could be initialised with numbers up to (4G)^2-1 (20
decimal positions).

In reality, only 15 decimal positions can be input correctly -- demonstrated
by the following snip (checked on 3.6.2 version):

a = uint64( 999999999999999 ) * 10000
b = uint64( 9999999999999999 )
a = a + 1
b = b+1

I feel the fix would be elementary, but the possible implications make me
stop and think -- is there a possibility to check the correctness of integer
arithmetics in 64 bits?




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