TODO List for Pod::Compiler
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* how to handle POD directives within a =begin ... =end block?
* how to treat tabs ( \t ) ?
* Handle consecutive =items and assign only one node for the first one,
but allow hyperlinks to all textual forms (very useful for perlfunc).
* honour -linelength also for command paragraphs
* test it with a complex converter
* rewrite podchecker based on this module