codeconsole opened a new pull request, #16772:
URL: https://github.com/apache/grails-core/pull/16772
`toProperties()` and `toFlatConfig()` exported each entry of a map written
by map subscripts twice, under its bracketed flat key and under the dotted name
the walk of the map gives it:
```groovy
// application.yml: app.routes: { '[/api/**]': x, '[/v1.0/**]': y }
config.toProperties().stringPropertyNames().findAll {
it.startsWith('app.routes') }
// was [app.routes[/api/**], app.routes./api/**, app.routes[/v1.0/**],
app.routes./v1.0/**]
// now [app.routes[/api/**], app.routes[/v1.0/**]]
```
Spring Boot binds the dotted names with their special characters removed, so
a map bound from the export, as `doWithConfig` publishes it in a test or a
plugin binds it, held keys such as `api` and `v10` beside `/api/**` and
`/v1.0/**`. Each entry is now exported once, by its bracketed key; a map put as
a value, which has no bracketed flat keys, is still exported by the dotted
names of its entries. `PropertySourcesConfigSpec` checks the exported names and
binds the export with Spring Boot's `Binder`.
Found while working on #16732; the bug is the same on every branch from
7.0.x to 9.0.x.
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