+ +{
+ map {
+ $_ => +{
+ map {
+ ($_->[4] => 0 ), # future
+ ($_->[3] => .5), # next
+ ($_->[0] => 5 ), # past
+ ($_->[1] => 10 ), # previous
+ ($_->[2] => 30 ), # current
+ } $caniuse->{agents}->{$_}->{versions}
+ }
+ } @browsers
+ }; # fallback hash based on release semantics