Typical modularization of R code is done through packages. However, packages have a few design limitations that prevents their widespread use by developers.
Both of these limitations are legitimate problems because organizing large codebases managed by teams of dozens or hundreds of developers is difficult or unpleasant without a sane hierarchical namespacing system.
Modules aim to partially allay this problem by building a hierarchical namespacing mechanism on top of environments, a well-defined and well-understood primitive data structure in R.
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