tibblify 0.3.1

• 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.

tibblify 0.3.0

• 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.

tibblify 0.2.0

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.