In-Game: [HTML5] Various ..._exists() functions incorrectly return "true" for invalid references in 2023.8/800s

[iampremo]

When targeting HTML5 with a project using the _exists() functions on various different asset types, many incorrectly return true when passed invalid references, e.g. passing an object into sprite_exists(). Other than instance_exists(), these all return false as expected on VM target.

Typed Handles HTML5.zip

The following functions are affected:

• sprite_exists()
• instance_exists()
• object_exists()
• room_exists()
• script_exists()

Expected
It is expected that all of the above functions return false when passed invalid references.

Steps

• Open attached project
• Set target to HTML5
• Run game using debugger
• In Debug Output, observe that the above functions all return true
  Repro: 100%

[jackerley]

References aren't fully supported in html5, so we have no way of distinguishing between assets whose indices overlap