Hi All, I like the recently introduced ScopedValue type, but found myself wanting to be able to change it’s default value persistently outside of ScopedValues.with calls. An example for this is that in GitHub - JuliaPluto/PlutoPlotly.jl I default to converting all numbers to Float32 to speed up an…

One of the central premises of ScopedValue is that you observe the same value inside the scoped value as long as you have not executed a with operation along your dynamical execution. It is totally fine to use a RefValue as a value for a ScopedValue. The only “benefit” I see here is that you avoid s…

Change `ScopedValue` default outside of `with`

General Usage

ericphanson October 19, 2025, 6:52pm 5

Maybe ANN: ScopedSettings - ScopedValues with malleable global values meets your needs?

Topic		Replies	Views
ANN: ScopedSettings - ScopedValues with malleable global values Package Announcements	0	164	July 22, 2025
Question on RefValue General Usage	12	2735	January 18, 2021
Mutable field in immutable type General Usage question	7	3918	December 22, 2019
Naming of ScopedValues Internals & Design	26	1320	March 7, 2024
How to modify value of scalar argument passed to function so that it persists in calling function? New to Julia	8	3063	August 4, 2019

Change `ScopedValue` default outside of `with`

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