s/=\(..*\)/="\1"/;
# but remove again from decimal numbers
s/="\([0-9][0-9]*\)"/=\1/;
+ # ... and from negative decimal numbers
+ s/="\(-[1-9][0-9]*\)"/=\1/;
# ... and from hex numbers
s/="\(0[Xx][0-9a-fA-F][0-9a-fA-F]*\)"/=\1/;
# ... and from configs defined from other configs