tibblify 0.4.0

Breaking changes

All arguments of functions that accept meaningful named ... are now prefixed with . to minimize conflicts with column and object names in .... The un-dotted versions of the arguments are still accepted, but calling functions directly with un-dotted arguments will produce a warning once per session (see ?lifecycle::deprecate_soft()). Un-dotted arguments will be phased out in a future version of this package, so we recommend switching to the dot-prefixed versions. See ?tspec_df and ?tib_scalar() for details (#228).

All code has been refactored for maintainability. While we were careful to ensure that output is unchanged, it is possible that a corner case is no longer handled how it was in version 0.3.0. Please notify us (https://github.com/wranglezone/tibblify/issues) if something has changed for the worse in an unexpected way (#243).

The guess_tspec() variants guess_tspec_list() and guess_tspec_object_list() are now exported (along with guess_tspec_df() and guess_tspec_object(), which were already exported). guess_tspec() should correctly guess the format in most cases, but you can call the variant directly if you think guess_tspec() is dispatching incorrectly (#249).
untibblify() now automatically uses the tib_spec attribute when present, so tibblified objects can be round-tripped without explicitly passing the spec (#235).
parse_openapi_spec() supports many more fields and works for many more APIs (#170, #186, #190, #200, @jonthegeek and @mgirlich).

The underlying C implementation has been updated to comply with R’s C API. We also fixed various bugs during this update (#203, #204, #222).

All vignettes and the documentation of all functions have been updated for clarity (#243).

New parse_openapi_spec() and parse_openapi_schema() to convert an OpenAPI specification to a tibblify specification.
Fix ptype of a tib_vector() inside a tib_df().
New unpack_tspec() to unpack the elements of tib_row() fields (#165).
Improved printing of lists parsed with tspec_object().
Improved performance of the tspec() family.
Improved guessing.

In column major format all fields are required.
Fixed a memory leak.
tib_vector() is now uses less memory and is faster.
tspec_*(), tib_df(), and tib_row() now discard NULL in .... This makes it easier to add a field conditionally with, for example tspec_df(if (x) tib_int("a")).
tib_variant() and tib_vector() give you more control for transforming:
- transform is now applied to the whole vector.
- There is a new elt_transform argument that is applied to every element.
New tspec_recursive() and tib_recursive() to parse tree like structure, e.g. a directory structure with its children.

Major rewrite of the tibblify package with lots of benefits:

tibblify() is now implemented in C and therefore way faster.
Support of column major format.
Support for vectors as scalar lists and objects.
Specification functions have been renamed
- lcols() to tspec_df()
- new specs tspec_object() and tspec_row()
- lcol_int() to tib_int() etc
tspec_df() gains an argument .names_to to store the names of a recordlist in a column.
Added untibblify() to turn a tibble into a nested list, i.e. to reverse the action of tibblify().
Added spec_combine() to combine multiple specifications.
Added argument unspecified to tibblify() to control how to handle unspecified fields.
Many bugfixes.