Bug in merging of blocks

[eGavr]

a {
 color:red;
}

a {
 background: 0 0;
}

b {
 color:red;
}

b {
 background:0 0;
}

I have received

a{color:red;background:0 0}b{color:red;background:0 0}

but I suppose it should be something like this

a,b{color:red;background:0 0}

Or this test

a, b {
 color:red;
 background:0, 0
}


b {
 color:red;
}

is minimized to

a,b{color:red;background:0,0}b{color:red}

but can be minimized to

a,b{color:red;background:0,0}

Another test concerning this bug

.test {
color: red}

.empty {}

.test {
 height:100px
}

is minimized to

.test{color:red}.test{height:100px}