Added PyRefMap and PyRefMapMut for borrowing data nested within a PyRef/PyRefMut
#4203
Commits on May 23, 2024
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Implemented second draft of
PyRefMapandPyRefMapMut. These struc……ts are now opaque, w.r.t. the owner, including both the `PyRef` flavor and the underlying pyclass.
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Implemented third draft of
PyRefMapandPyRefMapMut. The `PyRefMa……p` struct is now opaque w.r.t. only the `PyRef` flavor and the `Frozen`-ness of the pyclass so that the struct can use either `PyRef` or `PyRefMut` as the owner. `PyRefMapMut` is no longer opaque since it only needs to support `PyRefMut` where `T` is `Frozen`.
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Implemented fourth draft of
PyRefMapandPyRefMapMut. Both types ……are now aliases for a single struct `PyRefMapBase` that has a `Mut: Boolean` generic parameter indicating whether it supports `DerefMut`. The underlying `PyRef`/`PyRefMut` flavor is opaque, as well as the pyclass `Frozen`-ness, but the pyclass type is visible.
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Implemented fifth draft of
PyRefMapandPyRefMapMut. The is simil……ar to the 4th draft, with a single base struct being reused for both `PyRefMap` and `PyRefMapMut`, but the pyclass type is now opaque as well.
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