Log level in lowercase works for quarkus.log.category."whatever".level, but doesn't work for quarkus.log.level

[vladykin]

Describe the bug

Quarkus supports setting root log level and per-category log levels:

quarkus.log.level=INFO
quarkus.log.category.\"io.quarkus\".level=DEBUG

Level written in lowercase for per-category log level is accepted by quarkus and works:

quarkus.log.category."io.quarkus".level=debug

But for root log level this does not work:

quarkus.log.level=debug

Quarkus refuses to start with the following error:

One or more configuration errors have prevented the application from starting. The errors are:
  - Unknown level "debug"

I expected that both root and per-category log levels support the same values: either uppercase only, or both upper and lowercase.

To Reproduce

1. Create sample project with https://code.quarkus.io/
2. Add the following to application.properties:

quarkus.log.level=debug
quarkus.log.category."io.quarkus".level=debug

Environment (please complete the following information):

• Output of uname -a: Linux 5.4.48-gentoo #2 SMP Wed Oct 7 20:15:36 MSK 2020 x86_64 Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz GenuineIntel GNU/Linux
• Output of java -version: openjdk version "11.0.9.1" 2020-11-04 LTS
• Quarkus version or git rev: 1.12.1.Final
• Build tool (ie. output of mvnw --version or gradlew --version): Apache Maven 3.6.3