SigningKey.from_pem may not support pkcs#8 v2

[Myse1f]

I'm using ecdsa 0.18.0b1, and trying to use it to load private key from pem file.

When I use SigningKey.from_pem(pem.encode(), password=None) to load pem file, the pem data is in PKCS#8 v2 format, RFC 5958:

-----BEGIN PRIVATE KEY-----
MFMCAQEwBQYDK2VwBCIEIGQqNAZlORmn1k4QrYz1FvO4fOQowS3GXQMqRKDzmx9P
oSMDIQCrO5iGM5hnLWrHavywoXekAoXPpYRuB0Dr6DjZF6FZkg==
-----END PRIVATE KEY-----

I got an error:

File "/usr/local/lib/python3.9/site-packages/ecdsa/keys.py", line 1020, in from_pem
    return cls.from_der(
  File "/usr/local/lib/python3.9/site-packages/ecdsa/keys.py", line 1119, in from_der
    raise der.UnexpectedDER(
ecdsa.der.UnexpectedDER: trailing junk inside the privateKey

Actually, I'm trying to build an application initially written in rust, and convert it to python version. So I need to parse pem file generated by rust version. I used Ed25519KeyPair::generate_pkcs8 to generate keys in PKC8 v2 format

[Myse1f]

The private key in pem above is Ed25519.