Minor change: "identical" -> "upward compatible"
Minor change: "identical" -> "upward compatible"

rsdoiel/picolisp,seanjensengrey/picolisp,rsdoiel/picolisp,rsdoiel/picolisp,rsdoiel/picolisp,rsdoiel/picolisp,seanjensengrey/picolisp,seanjensengrey/picolisp,rsdoiel/picolisp,seanjensengrey/picolisp,seanjensengrey/picolisp