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A general description is here.
Using a broad ‘exportPattern’ directive in a ‘NAMESPACE’ file is no longer allowed to export internal objects such as ‘.onLoad’ and ‘.__S3MethodsTable__.’ .
These are also excluded from imports, along with ‘.First.lib’.
The ‘pdf()’ device only includes the definition of the sRGB colorspace in the output file for the colormodels which use it (and not for ‘"gray"’ nor ‘"cmyk"’).