[Proposal] Global Stringify

[felangel]

Is your feature request related to a problem? Please describe.
It would be nice to have a way to globally configure stringify for all Equatable instances. The proposal includes a breaking change to refactor stringify from a bool to an enum in order to be able to support a "default" (normal) setting in addition to an "enabled" (always) and "disabled" (never) setting.

Describe the solution you'd like

class Credentials extends Equatable {
  final String username;
  final String password;

  const Credentials({this.username, this.password});

  @override
  List<Object> get props => [username, password];
}

// override stringify for all Equatable instances
EquatableConfig.stringify = true;

If stringify is overridden for an individual Equatable it will take precedence over the EquatableConfig value.

Addresses #60 and #65

[zepfietje]

@felangel could you elaborate on the behavior of the "default" (normal) setting?

[felangel]

@zepfietje the normal setting will result in just the runtimeType being printed.

[zepfietje]

@felangel what's the difference between normal and never?

[felangel]

Normal will defer to the EquatableConfig setting never will never stringify.

[zepfietje]

So why exactly would we need an enum? Isn't there a way to defer to the EquatableConfig by default and allow the stringify bool to be overridden for an individual Equatable?

[felangel]

@zepfietje good call...I've updated the issue to maintain a bool (which makes this a non-breaking change). The PR is open at #69 👍

[zepfietje]

@felangel this issue can now be unpinned. 👍