I'm not saying this an issue to be resolved -- just reporting it FYI.

0e69c4d appears to have introduced a major speed regression in many of the io.ascii benchmarks:

• AastexFloat
• AastexInt
• FixedWidthFloat
• FixedWidthInt
• FixedWidthNoHeaderFloat
• FixedWidthNoHeaderInt
• FixedWidthString
• IpacFloat
• IpacInt
• IpacString
• CoreSuite.time_base_splitter
• CoreSuite.time_continuation_inputter
• CoreSuite.time_convert_vals

It's a very simple change -- I suspect most of the time is just from adding a __getitem__ vs. not having one. I'm not sure if there's a way to fix the bug in another way, or if it matters. Like I say, just reporting it at this point.