ADDITIONAL SYSTEM INFORMATION :
Microsoft Windows [Version 10.0.18363.836]

openjdk version "14" 2020-03-17
OpenJDK Runtime Environment (build 14+36-1461)
OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)

A DESCRIPTION OF THE PROBLEM :
On Windows, System.getenv() is case-insensitive. Specifically, System.getenv().get("PATH") and System.env().get("Path") return the same value.

At the same time, ProcessBuilder.environment() is case-sensitive. System.getenv().get("PATH") and System.env().get("Path") return different values.

Expected behavior: The keys of both maps should be case-insensitive on Windows.