String methods

[itamarst]

The most worrisome change here is changing the way assertEqual works on Javascript and Go. If there are places where asserting identity matters then we should add assertIdentical and use it where appropriate.

[rhs]

Are you saying now that "objects", i.e. implementations of interfaces are now also compared by-value by assertEqual, e.g. if I do class Foo() {}, what does assertNotEqual(new Foo(), new Foo()) do?

I am going to try this now just for giggles. ;-)

[rhs]

Ok, this fails on Go and Javascript (and passes everywhere else):

class Foo {}

void test_identity() {
    assertNotEqual(new Foo(), new Foo());
}

[ark3]

Rather than growing primitives.q even more, can we put these type-specific tests into separate quark files? Maybe something like bi_string.q (for built-in) or lib_list.q or whatever? Something consistent would be great.