Based on a discussion started on p5p, I have revised the version object code to
always return the initializer string as the stringified version (much like I was
already doing for Module::Build::Version).  Thus what you put in is what you get
out; the sole exception is that the use of qv(1.2) *NOTE* one decimal place and
no leading 'v' *NOTE* will stringify as "v1.2" so we can successfully roundtrip
that value.

Attached, please find the patch to bring Module::Build into compliance.  I also
included a $VERSION scalar in M::B::Version, since that was missing (and already
patched in bleadperl).  I chose to keep the same $VERSION as the underlying
version.pm release.  I had to tweak a couple of tests that expected a leading
'v' (which the old code would prepend).

John

-- 
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Blvd
Suite H
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5747
=== lib/Module/Build/Version.pm
==================================================================
--- lib/Module/Build/Version.pm	(revision 2045)
+++ lib/Module/Build/Version.pm	(local)
@@ -1,7 +1,10 @@
 package Module::Build::Version;
 use strict;
 
-eval "use version 0.70";
+use vars qw($VERSION);
+$VERSION = 0.7201;
+
+eval "use version 0.7201";
 if ($@) { # can't locate version files, use our own
 
     # Avoid redefined warnings if an old version.pm was available
@@ -35,28 +38,6 @@
 use vars qw(@ISA);
 @ISA = qw(version);
 
-use overload (
-    '""' => \&stringify,
-);
-
-sub new {
-    my ($class, $value) = @_;
-    my $self = $class->SUPER::new($value);
-    $self->original($value);
-    return $self;
-}
-
-sub original {
-    my $self = shift;
-    $self->{original} = shift if @_;
-    return $self->{original};
-}
-
-sub stringify {
-    my $self = shift;
-    return $self->original;
-}
-
 1;
 __DATA__
 # stub version module to make everything else happy
@@ -94,7 +75,7 @@
 
 use locale;
 use vars qw ($VERSION @ISA @REGEXS);
-$VERSION = 0.71;
+$VERSION = 0.7201;
 
 push @REGEXS, qr/
 	^v?	# optional leading 'v'
@@ -124,6 +105,7 @@
 	    # RT #19517 - special case for undef comparison
 	    # or someone forgot to pass a value
 	    push @{$self->{version}}, 0;
+	    $self->{original} = "0";
 	    return ($self);
 	}
 
@@ -312,6 +294,9 @@
 	         "ignoring: '".substr($value,$pos)."'";
 	}
 
+	# cache the original value for use when stringification
+	$self->{original} = substr($value,0,$pos);
+
 	return ($self);
 }
 
@@ -399,12 +384,7 @@
 	require Carp;
 	Carp::croak("Invalid version object");
     }
-    if ( exists $self->{qv} ) {
-	return $self->normal;
-    }
-    else {
-	return $self->numify;
-    }
+    return $self->{original};
 }
 
 sub vcmp
@@ -495,8 +475,9 @@
     my ($value) = @_;
 
     $value = _un_vstring($value);
-    $value = 'v'.$value unless $value =~ /^v/;
-    return version->new($value); # always use base class
+    $value = 'v'.$value unless $value =~ /(^v|\d+\.\d+\.\d)/;
+    my $version = version->new($value); # always use base class
+    return $version;
 }
 
 sub is_qv {
@@ -585,13 +566,13 @@
 		    Carp::croak( 
 			sprintf ("%s version %s required--".
 			    "this is only version %s", $class,
-			    $req->numify, $version->numify)
+			    $req->stringify, $version->stringify)
 		    );
 		}
 	    }
 	}
 
-	return defined $version ? $version->numify : undef;
+	return defined $version ? $version->stringify : undef;
     };
 }
 
=== t/metadata.t
==================================================================
--- t/metadata.t	(revision 2045)
+++ t/metadata.t	(local)
@@ -147,8 +147,8 @@
 ---
   $dist->regen;
   my $provides = new_build()->prepare_metadata()->{provides};
-  is $provides->{'Simple'}{version}, 'v0.60.128', "Check version";
-  is $provides->{'Simple::Simon'}{version}, 'v0.61.129', "Check version";
+  is $provides->{'Simple'}{version}, '0.60.128', "Check version";
+  is $provides->{'Simple::Simon'}{version}, '0.61.129', "Check version";
   is ref($provides->{'Simple'}{version}), '', "Versions from prepare_metadata() aren't refs";
   is ref($provides->{'Simple::Simon'}{version}), '', "Versions from prepare_metadata() aren't refs";
 }
=== t/moduleinfo.t
==================================================================
--- t/moduleinfo.t	(revision 2045)
+++ t/moduleinfo.t	(local)
@@ -419,10 +419,10 @@
 
   $pm_info = Module::Build::ModuleInfo->new_from_file('lib/Simple.pm');
   is( $pm_info->name, 'Simple', 'found default package' );
-  is( $pm_info->version, 'v0.60.128', 'version for default package' );
+  is( $pm_info->version, '0.60.128', 'version for default package' );
   my @packages = $pm_info->packages_inside;
   is_deeply([sort @packages], ['Simple', 'Simple::Simon']);
-  is( $pm_info->version('Simple::Simon'), 'v0.61.129', 'version for embedded package' );
+  is( $pm_info->version('Simple::Simon'), '0.61.129', 'version for embedded package' );
 }
 
 

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