test_isa.nit:25,7--19: Warning: expression is already a `Object`.
test_isa.nit:34,7--19: Warning: expression is already a `Object`.
test_isa.nit:43,7--28: Warning: expression is already a `nullable Object`.
int:
true
true
true
true
true
true
string:
true
true
true
true
true
true
null:
true
true
true
true
true
true