如何防止jq自动将double转换为int? [英] How to prevent jq from automatically converting double to int?

问题描述

我有input_file:

{"hi":48.0, "yep":48.123}

我运行这个

jq . < input_file > output_file
cat output_file

我的输出:

{
  "yep": 48.123,
  "hi": 48
}

我希望输出为

{
  "yep": 48.123,
  "hi": 48.0
}

如何防止jq将我的双精度值自动转换为int?

How do I prevent jq from automatically converting my double values to an int?

推荐答案

jq将数字解析为C个双精度数.然后，将其格式化为数字.这种转换有两种损失方式:a)有很多方式可以表示相同的数字，但是jq只使用一种表示，否则没有其他选择，b)C的双精度具有有限的精度.

jq parses numbers into C doubles. It then formats them back as numbers. This conversion is lossy in two ways: a) there are many ways to represent the same number, but jq uses only one and has no options to do otherwise, b) C doubles have finite precision.

关于这两个问题，jq存在一些问题.可能的解决方案是采用bignum/bigfloat方法，并保持原始数字字符串保留未修改的数字(原样； jq将所有数据视为写时复制).但这还没有实现.

There are issues open against jq about both problems. The likely solution will be to adopt a bignum/bigfloat approach, and to keep the original number string for numbers passed through unmodified (as it were; jq treats all data as copy-on-write). But that isn't implemented yet.

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