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It then becomes possible to combine the return type info with the input type info to limit the number of cases to handle"
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should not be too hard to make it work for graphs"
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2. The types which may have been added are therefore:
(difference input-types output-types) ∩ fields-mentionned-in-with*"
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This issue also occurs with node creation functions too (but they are functions, so they can at least be passed around)"
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We know what the original may be statically (one of the graph's nodes)."
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(U (tagged tag all-fields …)
(tagged WITH extra-fields … (tagged tag original-fields))
Problem with that: it won't work with functional updates (i.e. it'll work only with+, not with!! nor with!)
because the with!! won't know what is the type of the tagged structure."
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label="Optionnally parameterize node types with an extra polymorphic type for the "row"
This poly type encapsulates the "extra" fields.
The return type of the mapping should indicate that the node has a "row" and which tvar to use
Statically, we can recognize that from the input, and perform the merge in an easy way"
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label="Cheapy trivial tracking: use let-syntax on the inputs, so that we know their type"
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auto-create the node, filling each field via (get-field f result) || (get-field f (next result)) || …
and with! etc. only return a sort of pair with the new or overwritten fields in a tagged structure at the front, and the original in the rest"
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label="Bind the result with let, letting it infer the type,
grab the fields with get-field/fallback
and only enforce the type on the result / on the individual fields"
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label="Subtyping and recursive types with TR sometimes rejects valid subtyping relationships"
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label="Not so much of a problem,
because we don't use subtyping, we use *bounded* row polymorphism
so we always know the exact list of types allwed,
and don't really use the subtyping aside from (U alt₁ … altₙ) at the top"
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The node name should be concise enough that it's not too much of a pain to write it in a lot of places."
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and use that information to make a large case handling"
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label="I doubt we could find a way to infer the graph row variable to pass in a feasible way.
We could override #%app to allow a more concise syntax, but that's it."
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label="Representation as a binary tree with fields as the leaves.
To avoid the memory cost of carrying the intermediate nodes, we actually store the fields inside a closure,
which builds and returns the tree on request.
When initially building such records, known record types can be represented in a compact way.
When the record is updated (add / remove / modify fields), a series of "delta" patches are stored,
with a memory cost of O(1) per patch and a run-time extraction cost of O(log N) per patch (where N is the total number of fields in the program)"
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label="To also get occurrence typing (probably not across modified versions of a record, only for the same exact unmodified record),
we can turn the closure over the field values (which is a thunk) into a pure promise.
Accessing the fields will be slower (O(log N) + O(log N) per patch), but at least it can be done without loss of functionality
(accesses of modified records within a mapping should be rare in practice, so the cost is acceptble)"
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label="Problem: how do we make the field accessors "hybrid",
i.e. working both on fixed records and flex records?
We don't want nested field accesses to build up a tower of U types,
which makes acceesses very costly for the typechecker"
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label="Problem: types like Has-get and the same tagged structure type
won't accept flex structs with the right fields
Adding a (U …) will make an exponential type size → not good"
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label="We have to require that the user converts back to the tagged structure representation
when passing to something which expects a tagged structure
(i.e. distinguish the tagged structure types, and the flex tagged structure types)"
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<child ID="523"
label="Possible improvement: count the number of patches, when it goes beyond a certain threshold,
recopy all the fields"
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