A helper that could be used to get the root invocation target from a zcap would be helpful because well-known API paths can be added onto the root invocation target -- for zcaps that grant authority to some base in the path hierarchy.
For example, if a zcap has a invocation target of either <root invocation target>, <root invocation target>/foo or <root invocation target>/foo/bar, each can be used to hit well-known path: <root invocation target>/foo/bar/baz. The helper would return <root invocation target> for any of these zcaps, allowing the target URL to then be constructed from that.
A helper that could be used to get the root invocation target from a zcap would be helpful because well-known API paths can be added onto the root invocation target -- for zcaps that grant authority to some base in the path hierarchy.
For example, if a zcap has a invocation target of either
<root invocation target>,<root invocation target>/fooor<root invocation target>/foo/bar, each can be used to hit well-known path:<root invocation target>/foo/bar/baz. The helper would return<root invocation target>for any of these zcaps, allowing the target URL to then be constructed from that.