Do not put extension methods into the System namespaces

[sandrock]

Invading the System namespaces should not continue. But what namespace should we use?

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Use a prefix notation like this?

• System -> SrkToolkit.System
• System.Collections -> SrkToolkit.System.Collections
• ...

(-) This may lead to a lot of new using statements.
(+) Fine-grained choice of extensions to use

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Or use a single namespace? SrkToolkit.Extensions?

(-) This may lead to a binary choice of using all referenced toolkits or none.
(+) Binary-grained choice of extensions to use

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Or put extensions in each nuget's namespace? SrkToolkit.Common, SrkToolkit.Web...

(+) Coarse-grained choice of extensions to use
(+) This may lead to an acceptable quantity of new using statements.