private boolean isEqual(Milestone a, Milestone b) {
        if (a == null && b == null) {
            return true;
        }
        return a != null && b != null && a.number() == b.number();
    }
Get display {@link CharSequence} representing this filter

@return display
app/src/main/java/com/github/pockethub/android/core/issue/IssueFilter.java