Provides names to read builders for clearer error messages. Exceptions raised from user code are annotated with these names.
The common atom builders (at_header etc) now have labels derived from their arguments
Read.Streaming.list_of_headers
Returns the list of headers that appear in the file in the same order as they appear. Like the existing Read.Streaming.headers function, but that returns a set.
Read.load_lines
Load a list of rows from a given filename, using the provided builder for parsing.