what to do about discontinuities

[cprice404]

what to do about discontinuities

[anitarua]

We discussed with Kenny and determined we'll eventually have two subscribe methods:

• The basic subscribe method will return only values (string or binary), meaning we can remove the Discontinuity type and a pattern matching layer from the Rust SDK for now
• The advanced method (to be named) that will return SubscriptionItems that include values, discontinuities, heartbeats, etc future messages we want to return

Side note: we may want to audit our SDKs to see which subscriptions are callback-based (in which case this isn't a problem) and which are iterator-based (which use enums that we may need to change in future)