I finally tracked down the intermittent json parsing bug. it was an escaped character other than a quote that was killing it. I'm not sure how to attach the patch, though. Pasting in the text box seems to be a nonstarter as the fandoc processing munges it.

why don't you can you just email me the patch

I pushed these fixes:

• fixed escape handling in parse/write
• changed fractional numbers to parse as Float instead of Decimal
• we were trying to interpret a string as Duration or Uri, I removed that
• optimized to use addChar/writeChar instead of Int.toChar