Binds every other variable holding the same object as the variable name (copied from it by y <- x, see InGraphIdentifierDefinition#envId) to the change in place change as well (x[, a := 9L]), which reaches all of them.
name
y <- x
change
x[, a := 9L]
Binds every other variable holding the same object as the variable
name(copied from it byy <- x, see InGraphIdentifierDefinition#envId) to the change in placechangeas well (x[, a := 9L]), which reaches all of them.