Discord.js: Trying to overwrite users property

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Please describe the problem you are having in as much detail as possible:
If you attempt to overwrite the client's user store then the client will throw errors, the users property should not be allowed to be overwritten.

Include a reproducible code sample here, if possible:

this.client.users = null; // null can be anything

Further details:

• discord.js version: master v12
• Node.js version: any
• Operating system: any
• Priority this issue should have – please be realistic and elaborate if possible:

• [x] I have also tested the issue on latest master, commit hash: 651ff81bd522c03b5c9724a3a8c14eeb88dcd6b9

[monbrey]

This is kinda universally true for all of its properties. I see people doing this by mistake all the time when they think they're adding a custom property, but actually replacing one that already exists.

[amishshah]

See @Monbrey's response