ID value changes between source mode and live preview

[goldfish]

Steps to reproduce

1. Create a new note
2. Add an ‘id’ property field
3. Enter source mode
4. Enter the value 751480158363451392
5. Switch out of source mode

Did you follow the troubleshooting guide? [Y/N]

Yes.

Expected result

I expect to see the same value (ending in 392)

Actual result

I see the last 3 digits change to 400.

Environment

Running on Linux right now but also verified on iOS.
SYSTEM INFO:
Obsidian version: v1.8.4
Installer version: v1.7.7
Operating system: #49-Ubuntu SMP PREEMPT_DYNAMIC Mon Nov 4 02:06:24 UTC 2024 6.8.0-49-generic
Login status: logged in
Language: en
Catalyst license: none
Insider build toggle: off
Live preview: on
Base theme: adapt to system
Community theme: none
Snippets enabled: 0
Restricted mode: on

RECOMMENDATIONS:
none

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Additional information

[Guapa]

Weird. Seems to work if stored as Text rather than Number:

[rigmarole]

@goldfish

Add an ‘id’ property field

Is this something you are doing, or is this a built-in property that Obsidian is generating via some command or convention? I assume this is your own property, and you’ve set it to type “Number”, correct?

I think you’re just reaching the maximum length of an integer in (Javascript I assume?) Obsidian. And so it’s rounding it off. It’s likely storing it in a bit-depth that you are exceeding.

It makes sense that storing it as a string would allow you to have any arbitrary length. If this is your own convention for storing unique ID numbers, I suggest you use strings. Unless you have a reason to compare the numerical value (greater than or less than, etc.)

Also, I don’t believe this has anything to do with Source Mode. You’ll see the same result if you reload or restart Obsidian. Or close and reopen the note.

[rigmarole]

Testing this out further. I looked up the biggest int in Javascript Number.MAX_SAFE_INTEGER - JavaScript | MDN

9007199254740991

And yes if I enter 9007199254740992 it works. If I enter 9007199254740993 it rounds back down to 9007199254740992

So I’m going to move this from bugs. This isn’t a bug. You’ve just a hit a limitation of integers in Javascript, and will have to work around it with fewer digits, or strings.