mod=example.com/basic/v2
base=example.com/basic
version=v2.1.0
release=v2.1.0
proxyVersions=example.com/basic@v1.1.2
-- want --
# example.com/basic/a
## compatible changes
A2: added

# example.com/basic/v2/b
## compatible changes
package added

# summary
Inferred base version: example.com/basic@v1.1.2
v2.1.0 is a valid semantic version for this release.