st: What is an integer for Stata?

[Sergiy Radyakin <serjradyakin@gmail.com>]

Dear All,

how to explain this?

        version 10.1
        . display 1e+04
        10000
        . capture confirm number 1e+04
        . display _rc
        0
        capture assert mod(1e+04,1)==0
        . display _rc
        0
        . clear
        . set obs 10000
        obs was 0, now 10000
        . set obs 1e+04
        '1e+04' found where integer expected
        r(198);

So what is an integer then? (or what is 1e+04 if not an integer?)

Link to help reference: http://www.stata.com/help.cgi?obs

Thank you,
     Sergiy Radyakin
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