I've switched debian packages to v8 due to upcomming changes in xulrunner in debian. Test suite fails on i386 (it is working on amd64) with

Tue Aug 23 07:43:49 [testsuite] going to run suite: js
cannot write to read-only object
cannot write to read-only object
cannot write to read-only object
cannot delete from read-only object

{ "a" : NumberLong("-4991432399172682752") }

-4991432399172683043
-4991432399172682752

{ b: -4991432399172682752 }

Tue Aug 23 07:43:49 [testsuite] dbtests/jstests.cpp:541 val != out.firstElement().numberLong() assertion: dbtests/jstests.cpp:541 val != out.firstElement().numberLong() -4991432399172683043 != -4991432399172682752

Tue Aug 23 07:43:49 [testsuite] FAIL: JSTests::NumberLong assertion: dbtests/jstests.cpp:541 val != out.firstElement().numberLong() -4991432399172683043 != -4991432399172682752

I am trying to build mongo with libv8-3.1.8.22_3.1.8.22-1_i386.deb, I haven't seen any relevant warning during build.

Reported as http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637370