languagesystem DFLT dflt;
languagesystem latn dflt;

feature calt {
    sub uni003A uni003D by alt_colon_equal;
    sub uni2190 by alt_backward_arrow;
    sub uni2192 by alt_forward_arrow;
    sub uni2194 by alt_double_arrow;

    ignore sub uni003C uni007C' uni003E;
    sub uni007C' uni003E by alt_bar;
} calt;