We use an older 2008 edition of IEEE754 standard

[anatoly-scherbakov]

@TallTed had mentioned at #619 that the text of the spec explicitly refers to IEEE754:2008 version while a newer 2019 version is available.

to confirm, I checked RFC8785 JSON Canonicalization Scheme (JCS) and RFC8259 The JavaScript Object Notation (JSON) Data Interchange Format for a specific IEEE754 version and found out they do not specify any.

We probably should:

• either upgrade the spec to use the latest version,
• or just avoid specifying standard version in these references just as the aforementioned RFCs do.