« Changelog History


vinyl v0.8.0 Release Notes

    • 👍 Overhaul of FieldRec: records with named fields. We now take advantage of the -XOverloadedLabels extension to support referring to record fields by names such a #myField.

    • A new ARec type for constant-time field access. You can convert a classic, HList-like Rec into an ARec with toARec, or back the other way with fromARec. An ARec uses an Array to store record fields, so the usual trade-offs between lists and arrays apply: lists are cheap to construct by adding an element to the head, but slow to access; it is expensive to modify the shape of an array, but element lookup is constant-time.

    Compatibility Break: The operator =: for constructing a record with a single field has changed. That operation is now known as =:=, while =: is now used to construct an ElField. It was decided that single-field record construction was not a common use-case, so the shorter name could be used for the more common operation. Apologies for making the upgrade a bit bumpy.