Mat-Badge size small ist too small

[DaSchTour]

What is the expected behavior?

MatBadgeSize=small creates a readable result

What is the current behavior?

MatBadgeSize=small is too small

Size is calculated from base of 12px by dividing with 2. I think small should not be half that big but maybe just 10%. But 6px is definitely not usable. And maybe the badge itself could be 2times smaller but the font-size may not be reduced that much.

What are the steps to reproduce?

Create a matBadge with matBadgeSize=small

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 7.3.1
Node: 8.10.0
OS: darwin x64
Angular: 7.2.4
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, platform-server, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/.DS_Store         <error>
@angular-devkit/architect         0.13.1
@angular-devkit/build-angular     0.13.1
@angular-devkit/build-optimizer   0.13.1
@angular-devkit/build-webpack     0.13.1
@angular-devkit/core              7.3.1
@angular-devkit/schematics        7.3.1
@angular/.DS_Store                <error>
@angular/cdk                      7.3.1
@angular/cli                      7.3.1
@angular/material                 7.3.1
@ngtools/.DS_Store                <error>
@ngtools/webpack                  7.3.1
@schematics/.DS_Store             <error>
@schematics/angular               7.3.1
@schematics/update                0.13.1
rxjs                              6.4.0
typescript                        3.2.4
webpack                           4.29.0

Is there anything else we should know?

[eTallang]

The large size doesn't look good either imo. If the badge contains two digits, they overflow. This is a pretty common use case.
https://stackblitz.com/edit/angular-upbq3s

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