Inconsistent 'toString' overriding in 'Text' implementations

[vzurauskas]

Some Text implementations like TextOf override toString(), while others, like JoinedText, don't. This behaviour is confusing, as sometimes invoking toString on a Text instance gives you a nice text representation, and sometimes you get the default one from Object. We should make it consistent.

I would prefer it if all of them overrode toString, because getting an actual text representation is what I would expect from a toString invoked on a Text instance. Also, it would be more convenient than asString because I wouldn't need to wrap it in UncheckedText. However, keep in mind that debugging becomes more difficult in case there are bugs in the Text implementations themselves, because the debuggers will usually invoke toString on watched objects to display their value on breakpoints. So I guess this is for ARC to decide, @llorllale

[0crat]

@llorllale/z please, pay attention to this issue

[llorllale]

@vzurauskas we have an open puzzle for this - see #1116

[0crat]

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[0crat]

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