Introduce LinkedMap and LinkedSet interfaces

[YuriyGorvitovskiy]

I need in my code to distinguish LinkedMap and Map as a field declaration, and function parameter. Using LInkedHashMap is inconvenient, because required always to cast result of Value.toLinkedMap(...) method to LInkedHashMap. Having Intermediate interface LinkedMap like SortedMap, will be very helpful.

Similar applies to LinkedSet interface.

[wrandelshofer]

Maybe, you could use the upcoming Sequenced Collection interfaces, or make the new interfaces compatible with them?
JEP draft: Sequenced Collections

[YuriyGorvitovskiy]

I would gladly use new Java interfaces, but io.vavr.collection.LinkedHashMap is not supporting it.
It will be great if LinkedHashMap implement LinkedMap interface or SequencedMap interface.

Similar io.vavr.collection.LinkedHashSet is implementing Set interface. So if you define LinkedSet or SequencedSet interface that will be implemented by LinkedHashSet, it will be great, also.