Metadata about objects to be printed
As an object is printed,
knit_meta(class = NULL, clean = TRUE)
- optionally return only metadata entries that inherit from the
specified class; the default,
NULL, returns all entries.
- whether to clean the collected metadata; by default, the
metadata stored in
knitris cleaned up once retrieved, because we may not want the metadata to be passed to the next
knit()call; to be defensive (i.e. not to have carryover
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