$FSObjType returns a string in SharePoint Custom Column Formatting

[deepwaterpaladin]

What type of issue is this?

Question

What SharePoint development model, framework, SDK or API is this about?

Site designs & site scripts

Target SharePoint environment

SharePoint Online

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• chrome version: Version 132.0.6834.83 (Official Build) (32-bit)

Issue description

Why does Sharepoint's Custom Column Formatting treat $FSObjType as a string, rather than an integer? Would it not make more sense for $FSObjType to be an integer?

// Incorrect usage
"display": {
                    "operator": "?",
                    "operands": [
                        {
                            "operator": "&&",
                            "operands": [
                                {
                                    "operator": "!=",
                                    "operands": [
                                        "[$FSObjType]",
                                        0
                                    ]
                                },
                                {
                                    "operator": "!=",
                                    "operands": [
                                        {
                                            "operator": "startsWith",
                                            "operands": [
                                                "[$ContentTypeId]",
                                                "0x0120D520"
                                            ]
                                        },
                                        true
                                    ]
                                }
                            ]
                        },
                        "flex",
                        "none"
                    ]
                }

// Correct usage
"display": {
                    "operator": "?",
                    "operands": [
                        {
                            "operator": "&&",
                            "operands": [
                                {
                                    "operator": "!=",
                                    "operands": [
                                        "[$FSObjType]",
                                        "0"
                                    ]
                                },
                                {
                                    "operator": "!=",
                                    "operands": [
                                        {
                                            "operator": "startsWith",
                                            "operands": [
                                                "[$ContentTypeId]",
                                                "0x0120D520"
                                            ]
                                        },
                                        true
                                    ]
                                }
                            ]
                        },
                        "flex",
                        "none"
                    ]
                }