DynamoDB
number型
Numbers are variable length, with up to 38 significant digits.
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/CapacityUnitCalculations.html
整数なら126bitまではOK, 127bitに満たない
code:bit.rb
2020-08-24 16:20:21
✘╹◡╹✘ < ruby -e 'puts (2**126).to_s.size'
38
2020-08-24 16:20:32
✘╹◡╹✘ < ruby -e 'puts (2**127).to_s.size'
39
小数だと変わる?