From @zoffixznet

is-prime coerces its argument into an Int, which produces some false results​:

<ZoffixWin> m​: say is-prime (2.5)
<camelia> rakudo-moar 9441bb​: OUTPUT«True␤»
<ZoffixWin> m​: say is-prime '2.4242'
<camelia> rakudo-moar 9441bb​: OUTPUT«True␤»

Relevant IRC conversation​: http://irclog.perlgeek.de/perl6/2015-12-27#i_11785594

Code in question​: https://github.com/rakudo/rakudo/blob/b69aa55c5ca36d1df2f5c837df86a9daa50164dc/src/core/Int.pm#L392

From @zoffixznet

Sent a PR for this in Rakudo​: rakudo/rakudo#656 and added extra tests for this in roast​: Raku/roast#92

From @zoffixznet

This has been fixed in rakudo/rakudo@8c56c11

@zoffixznet - Status changed from 'new' to 'resolved'

From @lizmat

On 27 Dec 2015, at 17​:14, Zoffix Znet (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by Zoffix Znet
# Please include the string​: [perl #​127044]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=127044 >

is-prime coerces its argument into an Int, which produces some false results​:

<ZoffixWin> m​: say is-prime (2.5)
<camelia> rakudo-moar 9441bb​: OUTPUT«True␤»
<ZoffixWin> m​: say is-prime '2.4242'
<camelia> rakudo-moar 9441bb​: OUTPUT«True␤»

Relevant IRC conversation​: http://irclog.perlgeek.de/perl6/2015-12-27#i_11785594

Code in question​: https://github.com/rakudo/rakudo/blob/b69aa55c5ca36d1df2f5c837df86a9daa50164dc/src/core/Int.pm#L392

Fixed with 8c56c1114cc63eeb8554403f2c , tests already added by Zoffix, can be closed.

Liz