Error in the path parsing

[pwichmann]

Many thanks for a useful library.

I think the path parsing methods still contain errors:
The following path is a valid SVG path:
M12 22a10 10 0 110-20 10 10 0 010 20z.
It is a minified path with two consecutive a commands. In those cases, the repeated a can be omitted. Furthermore, the binary flags can be written without separating whitespace.

The path can be visualised using this neat tool:
https://svg-path-visualizer.netlify.app/#M12%2022a10%2010%200%20110-20%2010%2010%200%20010%2020z

However, it cannot be parsed by svgpathtools.

File "/Users/pascalwichmann/anaconda3/envs/stg/lib/python3.9/site-packages/svgpathtools/parser.py", line 15, in parse_path
return Path(pathdef, current_pos=current_pos, tree_element=tree_element)
File "/Users/pascalwichmann/anaconda3/envs/stg/lib/python3.9/site-packages/svgpathtools/path.py", line 2439, in init
self._parse_path(segments[0], current_pos)
File "/Users/pascalwichmann/anaconda3/envs/stg/lib/python3.9/site-packages/svgpathtools/path.py", line 3304, in _parse_path
arc = float(elements.pop())
ValueError: could not convert string to float: 'z'

I found various other paths that also do not work (but have not checked if the cause is identical).

[pwichmann]

Interestingly, the original svg.path is able to parse it.