---
prelude: >
  Previously 'parameters' and 'parameter_defaults' specified in an
  environment file used to overwrite their existing values.
features:
- A new 'parameter_merge_strategies' section can be added to the
  environment file,  where 'default' and/or parameter specific
  merge strategies can be specified.
- Parameters and parameter defaults specified in the environment
  file would be merged as per their specified strategies.