What are the default Schedulers for each observable operator?

Question

This page on MSDN states that

If you do not use the overload which takes a scheduler as an argument, Rx will pick a default scheduler by using the pri

Answer 1

Wow, that was not trivial to find...

Deep within the bowels of the System.Reactive.Concurrency namespace, there is an internal static class called SchedulerDefaults, which is declared as:

internal static class SchedulerDefaults
{
    internal static IScheduler AsyncConversions 
    { get { return DefaultScheduler.Instance; }}

    internal static IScheduler ConstantTimeOperations 
    { get { return ImmediateScheduler.Instance; }}

    internal static IScheduler Iteration 
    { get { return CurrentThreadScheduler.Instance; }}

    internal static IScheduler TailRecursion 
    { get { return ImmediateScheduler.Instance; }}

    internal static IScheduler TimeBasedOperations 
    { get { return DefaultScheduler.Instance; }}
}

AsyncConversions is used by:

Start, ToAsync, FromAsyncPattern

ConstantTimeOperations is used by:

Empty, GetSchedulerForCurrentContext, Return, StartWith, Throw

Iteration is used by:

Generate, Range, Repeat, TakeLast, ToObservable, and the ReplaySubject<T>

TailRecursion is used by:

Run

TimeBasedOperations is used by:

Buffer, Delay, DelaySubscription, Generate, Interval, Sample, Skip, SkipLast
SkipUntil, Take, TakeLast, TakeLastBuffer, TakeUntil, Throttle, TimeInterval,
Timeout, Timer, Timestamp, Window