Bug fixes

• Fixed bug with date generator when any_na = TRUE

Internal changes

• Now doesn't require R >= 4.1

Major breaking changes

• The default length for vector generators has been changed from 1 to a range
  between 1 and 10.
• All parameters of the form frac_ have been replaced with any_, which take
  a logical value instead of a double value.

Features

• New character_letters generates character vectors with only letters.
• New character_numbers generates character vectors with only numbers.
• New character_alphanumeric generates character vectors with letters and numbers.
• New flat_list_of generates lists of atomic scalars.
• New data_frame_ generate data.frames.
• New data_frame_of generate data.frames.
• New data.table_ generate data.tables.
• New data.table_of generate data.tables.
• New anything generates any R object.
• New any_flat_homogeneous_list generates flat lists with homogeneous elements.
• New any_data_frame generates any data.frames.
• New any_data.table generates any data.tables.
• New any_undefined generates undefined values.
• New equal_length generates equal length vectors.
• New from_hedgehog converts a hedgehog to a quickcheck generator.
• New as_hedgehog converts a quickcheck to a hedgehog generator.
• New repeat_test tests a property repeatedly.

Initial release