1 files changed, 29 insertions, 14 deletions

diff --git a/Data-MultiValued/lib/Data/MultiValued/RangeContainer.pm b/Data-MultiValued/lib/Data/MultiValued/RangeContainer.pm
index 5c4fb3a..33864da 100644
--- a/Data-MultiValued/lib/Data/MultiValued/RangeContainer.pm
+++ b/Data-MultiValued/lib/Data/MultiValued/RangeContainer.pm
@@ -9,8 +9,8 @@ has _storage => (
     is => 'rw',
     isa => ArrayRef[
         Dict[
-            from => Num,
-            to => Num,
+            from => Num|Undef,
+            to => Num|Undef,
             value => Any,
         ],
     ],
@@ -21,7 +21,7 @@ has _storage => (
 sub get {
     my ($self,$args) = @_;
 
-    my $at = $args->{at} // 0-'inf';
+    my $at = $args->{at};
 
     my ($range) = $self->_get_slot_at($at);
 
@@ -34,12 +34,23 @@ sub get {
     return $range;
 }
 
+# Num|Undef,Num|Undef,Bool,Bool
+# the bools mean "treat the undef as +inf" (-inf when omitted/false)
+sub _cmp {
+    my ($a,$b,$sa,$sb) = @_;
+
+    $a //= $sa ? 0+'inf' : 0-'inf';
+    $b //= $sb ? 0+'inf' : 0-'inf';
+
+    return $a <=> $b;
+}
+
 sub _get_slot_at {
     my ($self,$at) = @_;
 
     for my $slot (@{$self->_storage}) {
-        next if $slot->{to} <= $at;
-        last if $slot->{from} > $at;
+        next if _cmp($slot->{to},$at,1,0) <= 0;
+        last if _cmp($slot->{from},$at,0,0) > 0;
         return $slot;
     }
     return;
@@ -56,10 +67,10 @@ sub _partition_slots {
     while (my ($idx,$slot) = each @$st) {
         my ($sf,$st) = @$slot{'from','to'};
 
-        if ($st<$from) {
+        if (_cmp($st,$from,1,0) <0) {
             push @before,$idx;
         }
-        elsif ($sf>=$to) {
+        elsif (_cmp($sf,$to,0,1) >=0) {
             push @after,$idx;
         }
         else {
@@ -72,17 +83,19 @@ sub _partition_slots {
 sub set_or_create {
     my ($self,$args) = @_;
 
-    my $from = $args->{from} // 0-'inf';
-    my $to = $args->{to} // 0+'inf';
+    my $from = $args->{from};
+    my $to = $args->{to};
 
-    Data::MultiValued::Exceptions::BadRange->({
+    Data::MultiValued::Exceptions::BadRange->throw({
         from => $from,
         to => $to,
-    }) if $from > $to;
+    }) if _cmp($from,$to,0,1)>0;
 
     my ($range) = $self->_get_slot_at($from);
 
-    if ($range && $range->{from}==$from && $range->{to}==$to) {
+    if ($range
+        && _cmp($range->{from},$from,0,0)==0
+        && _cmp($range->{to},$to,1,1)==0) {
         return $range;
     }
 
@@ -127,14 +140,16 @@ sub _create_slot {
         my $first = $self->_storage->[$first_to_replace];
         my $last = $self->_storage->[$last_to_replace];
 
-        if ($first->{from} < $from && $first->{to} >= $from) {
+        if (_cmp($first->{from},$from,0,0)<0
+            && _cmp($first->{to},$from,1,0)>=0) {
             unshift @replacement, {
                 from => $first->{from},
                 to => $from,
                 value => $first->{value},
             }
         }
-        if ($last->{from} < $to && $last->{to} >= $to) {
+        if (_cmp($last->{from},$to,0,1)<0
+            && _cmp($last->{to},$to,1,1)>=0) {
             push @replacement, {
                 from => $to,
                 to => $last->{to},