do we have any good way to push a dict or dict like object a

Question

do we have any good way to push a dict or dict like object across the FFI boundary other than encoding it as a tuple of pairs

aloof-angle-91616 · Answer

what else do you have in mind

hundreds-breakfast-49010 · Answer

I d like to be able to have a python object returned from the engine just include a dictionary but I don t think this is safe because dictionaries aren t hashable

hundreds-breakfast-49010 · Answer

and there s no dictionary equivalent of a frozenset

aloof-angle-91616 · Answer

we can do what twitter common collections does with OrderedSet and just have a frozenset of keys and a dict

aloof-angle-91616 · Answer

but it s not hard to add a dict to an object returned by the engine just with what we have now

aloof-angle-91616 · Answer

converting to a vector of tuples as we already do is probably hashable

hundreds-breakfast-49010 · Answer

hm I thought that a type we returned from an engine intrinsic had to be marked ` dataclass frozen=True ` or otherwise hashable and that this precluded using a `Dict` as one of the fields but apparently this works fine

aloof-angle-91616 · Answer

oh hm

aloof-angle-91616 · Answer

1 we can override the hash method I LITERALLY HATE SLACK S WYSIWYG EDITOR

aloof-angle-91616 · Answer

2 we can make the dataclass object actually contain a tuple of tuples and then convert it into a dict with an memoized property

hundreds-breakfast-49010 · Answer

so is it actually incorrect for a type returned from an engine intrinsic to have a `Dict` field I thought that either typechecking or some runtime check would catch this if it wasn t okay but it seems to work fine

aloof-angle-91616 · Answer

can you call hash on it

hundreds-breakfast-49010 · Answer

nope dict is unhashable

aloof-angle-91616 · Answer

that will lead to an error when externs identify is called on the object