Wrong type for setUsername

[nigelsim]

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I'm submitting a ...

• [x] bug report

• [ ] feature request

• [ ] question about the decisions made in the repository

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

The Angulartics2 service has a replay subject, setUsername that takes the type { userId: string | number } | string. However, none of the providers accept this type. They all accept only string.

• What is the expected behavior?

Types to match

• What is the motivation / use case for changing the behavior?

Invalid user identifiers have been sent through to MixPanel.

• Environment:

please run the following and copy the output

Angular CLI: 9.1.9
Node: 10.19.0
OS: linux x64

Angular: 9.1.11
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router, upgrade
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.25
@angular-devkit/build-angular     0.803.25
@angular-devkit/build-optimizer   0.803.25
@angular-devkit/build-webpack     0.803.25
@angular-devkit/core              8.3.25
@angular-devkit/schematics        9.1.9
@angular/cli                      9.1.9
@ngtools/webpack                  8.3.25
@schematics/angular               9.1.9
@schematics/update                0.901.9
rxjs                              6.6.2
typescript                        3.9.7
webpack                           4.43.0