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Wrong float values via `findCustomMessageOption`

See original GitHub issue

I ran into a float decoding issue with the output of findCustomMessageOption() when generating code for float validation rules as defined here:

The value 1.23 in that float.const option is turned into 1.2300000190734863 once it reaches my protoplugin code generator here.

As seen here (in the output):

Is that a known issue or am I doing sth. wrong or is there a bug with that? I can dig deeper myself if nothing comes to mind right away but I thought I’d ask first …

Issue Analytics

  • State:closed
  • Created a year ago
  • Comments:6 (6 by maintainers)

github_iconTop GitHub Comments

smaye81commented, Nov 2, 2022

Yeah meant to respond. After some investigation to verify we are parsing these correctly, this actually is expected just by the nature of precision with floating-point in JavaScript. There’s really not much we can do to alleviate it, since it’s part of the language itself.

fubhycommented, Nov 2, 2022

I guess it boils down to this …

const view = new DataView(new ArrayBuffer(16));
view.setFloat32(0, 1.23, true);
view.getFloat32(0, true); // 1.2300000190734863

Which, I guess, is expected.

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