cargo contract new commond can create contract that the name start with a digit ,but cargo not support it

[gpBlockchain]

step 1：
cargo contract new 123hahah

step 2:
cd 123hahah
cargo +nightly test
result :
test@MacBook-Pro-4 12haha % cargo +nightly test
error: failed to parse manifest at /Users/test/testEnv/1/12haha/Cargo.toml

Caused by:
the name 12haha cannot be used as a package name, the name cannot start with a digit