fn readChar6(bc: *BitcodeReader) !u8
fn readChar6(bc: *BitcodeReader) !u8 { return switch (try bc.readFixed(u6, 6)) { 0...25 => |c| @as(u8, c - 0) + 'a', 26...51 => |c| @as(u8, c - 26) + 'A', 52...61 => |c| @as(u8, c - 52) + '0', 62 => '.', 63 => '_', }; }