API Security > Basic Auth Header Scheme is sent in Upper case and not camelcase according to the Specification

When securing a downstream API using Basic Auth, APIMan is providing the scheme name in uppercase e.g. BASIC instead of Basic

"headers": {
    "Authorization": "BASIC dXNlcm5hbWU6cGFzc3dvcmQ=",
  },

According to the specification, Basic is the correct scheme to use.

This is preventing the downstream server/service to recognise the Basic authentication header, as it only recognises the Basic scheme and not BASIC that APIMan is sending.

Is this a configurable property? The majority of articles online refer to the Basic Authorization scheme. This is marked as a blocker as our current servers do not recognise the BASIC scheme.