columna API reference - v0.4.1
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    Type Alias IoSource

    IoSource:
        | string
        | URL
        | Uint8Array
        | ArrayBuffer
        | Blob
        | { text: string }
        | { path: string }
        | { url: string | URL }

    What a reader accepts. Prefer the explicit forms — { path }, { url }, { text } (or io.path() etc.) — whenever the string comes from outside the program; a bare string is classified heuristically (http(s):// → fetch, path-like → file, else content) unless mode says otherwise.