Durable Object and Worker via Service Binding sub request limits

Hello, I'm looking for some clarification of Worker limits, please, specifically the sub request limits and how they span Durable Object invocations, and invocations of other Workers via service bindings.

A Worker has a sub request limit of 1000, if it invokes 10 Durable Objects, do those 10 Durable Object executions each get a 1000 sub request limit? Or do they share the original 1000 with the calling worker?

Likewise, if Worker A invokes Worker B via a service binding, does Worker B get a fresh limit of 1000, or is there 1000 shared between A and B?
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