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China built a few Ap1000 designs. The Sanmen station started in 2009 with completion expected in 2014 (2015 for the second unit). It went into 2019. The second, Haiyang, went about the same.
This is pretty similar to what happened in the US with Volgte.
JSON numeric encoding is perfectly capable of precise encoding to arbitrary decimal precision. Strings are easier if you don’t want to fuck around with the parser, though.