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Mapping from compile expressions (as strings) to their ForeignHValues

Store the result of compiling and loading a raw expression string.

Note: it is easy to wrongly cache arbitrary compilation strings. You shouldn't do this lightly since these arbitrary strings typically are not very cacheable (there won't be many if any hits).

• *Instead, one should always prefer to use RemoteExpr to describe and load remote expression, which will be implicitly cached but at a much finer grained level.**

Look if the raw string value of an expression has already been compiled and loaded

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