Don't use is_a
Don't use is_a

christopheschwyzer/CM,njam/CM,christopheschwyzer/CM,fauvel/CM,mariansollmann/CM,fvovan/CM,fauvel/CM,mariansollmann/CM,tomaszdurka/CM,christopheschwyzer/CM,cargomedia/CM,vogdb/cm,tomaszdurka/CM,vogdb/cm,zazabe/cm,zazabe/cm,njam/CM,vogdb/cm,fauvel/CM,fvovan/CM,tomaszdurka/CM,tomaszdurka/CM,alexispeter/CM,christopheschwyzer/CM,njam/CM,cargomedia/CM,cargomedia/CM,mariansollmann/CM,zazabe/cm,alexispeter/CM,zazabe/cm,fauvel/CM,fvovan/CM,njam/CM,vogdb/cm,mariansollmann/CM,alexispeter/CM,njam/CM,vogdb/cm,fvovan/CM,alexispeter/CM,tomaszdurka/CM,fauvel/CM,cargomedia/CM