I've reproduced the problem also on an ubuntu 16.04 using mysql 5.7, apache 2.14.18 and php 7.0.18 using the attached survey

tested in "Version 2.59.1+170116" where it works as expected

git bisected the code. the commit that introduced the regression is:

9748fa9b5bcad5eafae4a24b7cb94ed61cbfb788 is the first bad commit
commit 9748fa9b5bcad5eafae4a24b7cb94ed61cbfb788
Author: Carsten Schmitz <(email address removed)>
Date: Tue Mar 7 13:45:17 2017 +0100

Fixed issue: Certain invalid numbers don't raise warning during entry                                                                                                

:040000 040000 8abec0b45927dd38202ac4b53327ad46135b59a7 e1a104f96276a05489ec956814f07c3df8b9e5ae M      scripts

The relevance equation set in the 2nd question in the sample survey reads Q1 < "10" so the behaviour is correct. It is a dictionary comparison in that case

It should read Q1<10 if you want a real numeric comparison.

@c_schmitz : you rigfht, except "condition to exression" add the quote

But why LS is putting quote around 10 if this is a response given to a numerical input. ?
(the condition was defined via GUI.)

@c_schmitz : line 960 of em_manager : can add a test:

if((string)floatval($value)!==(string) $value) {
$value = '"' . $value . '"';
}

Seems OK ?

Basically it is a bug in the Conditions to Relevance conversion that was uncovered now by my fix.
The right way would be to fix that one but it won't help with all the surveys that already use the wronlgy converted relevance.
So I will just water down my patch a bit again ;)

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=22921

https://github.com/LimeSurvey/LimeSurvey/commit/6320c3bb6340c088934f9fdbc8d0b2099681e37c ;).

But still : all old survey can have this issue :(

Thank you, Denis!

Version 2.65.2 released.

guys does this fix will take care of this regression: https://bugs.limesurvey.org/view.php?id=12456

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=24018