Cameron

Add `&mut World` as a system param and deprecate `.exclusive_system()`

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## Objective - finish what started in #2398 - make `.exclusive_system()` optional (`FunctionSystem` handles all systems now) - lay groundwork for bevyengine/rfcs#45 ## Solution - add ~~`SemiSafeCell` and have it...

Networked Replication

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[RENDERED](https://github.com/maniwani/rfcs/blob/main/networked_replication.md) Proposes an implementation of engine features for developing networked games. Main focus is replication with key interest in providing it transparently (i.e. minimal, if any, networking boilerplate).

Add global time scaling

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# Objective - Make `Time` API more consistent. - Support time accel/decel/pause. ## Solution This is just the `Time` half of #3002. I was told that part isn't controversial. -...

Add time scaling and simplify fixed timestep use

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## Objective - Fill out `Time` API. - Make using `FixedTimestep` less prone to user error. - Implement time scaling. - Improve documentation. ## Solution - Ensure the "delta" and...

# Objective Examples should use the correct tools for the job. ## Solution A fixed timestep, by design, can step multiple times consecutively in a single update. That property used...

# Objective Complete the first part of the migration detailed in bevyengine/rfcs#45. ## Solution Add all the new stuff. ### TODO - [x] Impl tuple methods. - [x] Impl chaining....

Take non-`Send` resources out of `World`

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This PR builds on top of #9202 (I separated what could be separated from this PR into that one). ## Objective The aim of this PR is to be the...

Add `Commands::run_schedule`

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Systems (especially observers) should be able to queue the execution of schedules (which are essentially a special kind of exclusive system). It's currently possible to queue the execution of a...