6182 - start of support for safe handles

So far it's unclear how to do this in a series of small commits. Still
nibbling around the edges. In this commit we standardize some terminology:

The length of an array or stream is denominated in the high-level elements.
The _size_ is denominated in bytes.

The thing we encode into the type is always the size, not the length.

There's still an open question of what to do about the Mu `length` operator.
I'd like to modify it to provide the length. Currently it provides the
size. If I can't fix that I'll rename it.

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