%0%                     Default value for empty vectors
df_ptype2               Coercion between two data frames
faq-error-incompatible-attributes
                        FAQ - Error/Warning: Some attributes are
                        incompatible
howto-faq-coercion      FAQ - How to implement ptype2 and cast methods?
howto-faq-coercion-data-frame
                        FAQ - How to implement ptype2 and cast methods?
                        (Data frames)
internal-faq-ptype2-identity
                        Internal FAQ - 'vec_ptype2()', 'NULL', and
                        unspecified vectors
list_of                 'list_of' S3 class for homogenous lists
name_spec               Name specifications
reference-faq-compatibility
                        FAQ - Is my class compatible with vctrs?
theory-faq-coercion     FAQ - How does coercion work in vctrs?
vec-rep                 Repeat a vector
vec_as_names            Retrieve and repair names
vec_assert              Assert an argument has known prototype and/or
                        size
vec_bind                Combine many data frames into one data frame
vec_c                   Combine many vectors into one vector
vec_cast                Cast a vector to a specified type
vec_chop                Chopping
vec_compare             Compare two vectors
vec_count               Count unique values in a vector
vec_duplicate           Find duplicated values
vec_equal               Test if two vectors are equal
vec_init                Initialize a vector
vec_is_list             Is the object a list?
vec_match               Find matching observations across vectors
vec_names               Get or set the names of a vector
vec_order               Order and sort vectors
vec_ptype               Find the prototype of a set of vectors
vec_ptype2.logical      Find the common type for a pair of vectors
vec_recycle             Vector recycling
vec_seq_along           Useful sequences
vec_size                Number of observations
vec_split               Split a vector into groups
vec_unique              Find and count unique values
