# Have `self' and `other' the same value?
##
# Implicitely, the default implementation, is ==
- meth ==(other: Object): Bool do return self is other
+ meth ==(other: nullable Object): Bool do return self is other
# Have `self' and `other' different values?
##
# != is equivament with "not =".
- meth !=(other: Object): Bool do return not (self == other)
+ meth !=(other: nullable Object): Bool do return not (self == other)
# Display self on stdout (debug only).
meth output