Can't assume roles with `ca_bundle` with home directory shortcut/alias (`~`)

[rasika-jay]

when I try to assume roles with a ca_bundle pointing to a file in the home directory using the ~ alias, i.e. ~/cert/cert.pem, it throws the error:

open ~/cert/cert.pem: no such file or directory

however, if I change the path absolute, i.e. /Users/myname/cert/cert.pem, it works.