{⟦
  org ↦ ⟦
    eolang ↦ ⟦
      sys ↦ ⟦
        os ↦ ⟦
          φ ↦ ξ.name,
          is-windows ↦ ⟦
            os-name ↦ Φ̇.dataized(ξ.ρ.name).as-bytes,
            φ ↦ ξ.os-name.size.gt(6).and(ξ.os-name.slice(0, 7).eq("Windows"))
          ⟧,
          is-linux ↦ Φ̇.txt.regex("/linux/i").matches(ξ.name).as-bool,
          is-macos ↦ Φ̇.txt.regex("/mac/i").matches(ξ.name).as-bool,
          name ↦ ⟦
            λ ⤍ Lorg_eolang_sys_os_name
          ⟧
        ⟧,
        λ ⤍ Package
      ⟧,
      λ ⤍ Package
    ⟧,
    λ ⤍ Package
  ⟧
⟧}