[Bug 1412052] New: prel Math:: BigInt regression in ignoring trailing whitespace

[bugzilla@xxxxxxxxxx]

https://bugzilla.redhat.com/show_bug.cgi?id=1412052

            Bug ID: 1412052
           Summary: prel Math::BigInt regression in ignoring trailing
                    whitespace
           Product: Fedora
           Version: 25
         Component: perl-Math-BigInt
          Severity: high
          Assignee: ppisar@xxxxxxxxxx
          Reporter: stewart@xxxxxxxxxxxxxxxxxx
        QA Contact: extras-qa@xxxxxxxxxxxxxxxxx
                CC: perl-devel@xxxxxxxxxxxxxxxxxxxxxxx, ppisar@xxxxxxxxxx



Description of problem:
The Math::BigInt manual states that leading and trailing whitespace is
ignored, and in fact this has been the behaviour for many years.

However, in recent Math::BigInt (that has shipped in Linux
distributions... e.g. Fedora 25), this behaviour is broken, which breaks
our tools that rely on this.

With Math::BigInt 1.999727:

'use Math::BigInt; print Dumper(Math::BigInt->new("0x10\n\t\t\t"));';
$VAR1 = bless( {
         'sign' => 'NaN',
         'value' => [
                  0
                ]
           }, 'Math::BigInt' );

With Math::BigInt 1.9993:
'use Math::BigInt; print Dumper(Math::BigInt->new("0x10\n\t\t\t"));';
$VAR1 = bless( {
         'sign' => '+',
         'value' => [
                  16
                ]
           }, 'Math::BigInt' );

The first version to exhibit this buggy behaviour was 1.999712, with
1.999710 and 1.9997_11 both not having the bug. All versions after
1.999712, including the latest, 1.999807 exhibit the bug.

Version-Release number of selected component (if applicable):
perl-Math-BigInt-1.9997.27-1.fc25.noarch

How reproducible:
100%

Steps to Reproduce:
1. Math::BigInt->new("0x10\n\t\t\t")

Actual results:
print Dumper(Math::BigInt->new("0x10\n\t\t\t"));';
$VAR1 = bless( {
         'sign' => 'NaN',
         'value' => [
                  0
                ]
           }, 'Math::BigInt' );

Expected results:
'use Math::BigInt; print Dumper(Math::BigInt->new("0x10\n\t\t\t"));';
$VAR1 = bless( {
         'sign' => '+',
         'value' => [
                  16
                ]
           }, 'Math::BigInt' );

Additional info:

I've reported this upstream, so I'm largely filing this as a Fedora bug so that
it's tracked for Fedora - as this means you cannot compile OpenPOWER firmware
on Fedora 25.

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