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Maximize with Integer constraints


given entry #1:


Maximize[
{x1 + x2 + x3 + x4,
Element[x1 | x2 | x3 | x4 , Integers] &&
0 <= x1 <= 5.6 &&
0 <= x2 <= 8.6 &&
0 <= x3 <= 9.7 &&
4.0 <= x4 <= 22.4 }, {x1, x2, x3, x4}]

{4., {x1 -> 0, x2 -> 0, x3 -> 0, x4 -> 4}}

note -  zeros for answers
entry #2:
Maximize[
{x1 + x2 + x3 + x4,
Element[x1 | x2 | x3 | x4 , Integers] &&
0 <= x1 <= 5.6 &&
0 <= x2 <= 8.6 &&
0 <= x3 <= 9.7 &&
4.1 <= x4 <= 22.4 }, {x1, x2, x3, x4}]

{44., {x1 -> 5, x2 -> 8, x3 -> 9, x4 -> 22}}

note good answers...
only difference is 4.1 vs. 4 in constraints
any ideas what is going on?

thanks,

sdw 



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