v0.4.0-rc2

Breaking changes

• reader package which replaces all sources packages
  • Merge functions in merge.go removed (now unneeded)
  • Settings reader now reads from multiple sources in order
  • sources/merger removed
  • sources/env removed (replaced by reader package)
  • Define Env reader-compatible Source
  • parse package generic functions accept source interfaces instead of keyValues map
  • Update all code comments, example and readme
• reader package: New takes a Settings struct as its unique argument
• Number constraint and constraints.go file removed
• Override: OverrideWithComparable function, replacing OverrideWithNumber, OverrideWithString, OverrideWithPointerRaw, OverrideWithInterface and OverrideWithSliceRaw
• Defaults: DefaultComparable function, replacing DefaultNumber, DefaultString, DefaultPointerRaw, DefaultInterface and DefaultSliceRaw
• parse package: try parsing the empty string if AllowEmpty(true) option is used

Features

• reader package: add DefaultOptions field to the Settings struct
• reader package: add FirstKeySet function

Fixes

• reader/parse package:
  • settings default properly set handleDeprecatedKey function
  • parseBool returns a bool pointer

Documentation

• Review code comments
  • fix godoc comments bullet list formatting
  • fix godoc comments new lines formatting
  • mention default settings for CSV methods
  • change the error context to its message
  • mention nil slices conditions for CSV methods
  • review AcceptEmpty option comment