Research: what is order/rule/behavior when YAML key and corresponding env is used

[Martin-Zeithaml]

zowe:
  environments:
    ZSS_PORT: 1234
    ZWE_components_zss_port: 5678
    # ZWE_components_zss_port: "this value is not schema validated"
components:
  zss:
    port: 9999

What is the zss port?

Notes:

1. ZSS_PORT is used somewhere in app-server.
2. There is no schema validation for env exactly corresponding to key (see commented example)

[MarkAckert]

Should we have logic which reviews identical fields between the environment variable and config definitions and spits out a warning?

[Martin-Zeithaml]

Warning is a minimal action.

There are also another issues, like this one:

zowe:
  environments:
    ZWE_zowe_externalDomains_1: one.example.com
  externalDomains:
    - zero.example.com:

YAML key zowe.externalDomains has one item, but there are two ZWE_zowe_externalDomains_* variables defined.