extReader:            extReader,
		symsByName:           [2]map[string]Sym{make(map[string]Sym, 80000), make(map[string]Sym, 50000)}, // preallocate ~2MB for ABI0 and ~1MB for ABI1 symbols
		objByPkg:             make(map[string]uint32),
		sub:                  make(map[Sym]Sym),
		dynimplib:            make(map[Sym]string),
		dynimpvers:           make(map[Sym]string),