v6 coverage test log output shows both "better" and "worse" messages

[chimericdream]

Describe the bug When running the coverageTotal test on the v6 release, I see both "(functions|lines)" coverage is worse... and `"(functions|lines)" coverage is better..." messages.

To Reproduce Unfortunately I cannot share the json summary file in question, but here is the Betterer config:

    'Test coverage': () =>
        coverageTotal('./coverage/json-summary.json')
            .include('./src/**/*.{js,cjs,mjs,ts,tsx}')
            .exclude(...ignores, './src/generated/**/*'),

Expected behavior Either a test gets better or it gets worse, not both.

Screenshots

Versions (please complete the following information):

• OS: MacOS 15.4 (24E248)
• Betterer Version 6.0.0-alpha.1
• Node Version 22.14.0