On Mon, Mar 19, 2018 at 10:09 AM, Anders Rundgren <
[email protected]> wrote:
> On 2018-03-19 14:43, Mike Samuel wrote:
>
>> Maybe have a parser function that receive the text of the number? If no
>> callout is specified, it could throw an appropriate error.
>>
>> JSON.safeParse(json, optionalReviver, optionalParseUnrepresentable)
>>
>> That would allow it to tie into future proposals like decimal, and in
>> conjunction with a reviver could treat an array of numbers known to be
>> large as an Int64Array view over an ArrayBuffer.
>>
>
> I may be off here, but don't you also need something like rawToJSON for
> JSON.stringify()?
> That is, rawToJSON would return a string which is used "as is".
>
Quite right, you would need some adjustment to stringify too.
We could change the contract of toJSON so that if it returns a value with a
certain runtime type, then JSON.stringify asserts that it is a
syntactically valid ES404 value and then uses it inline. For example,
({[Symbol('rawJSON')]: "1" + "0".repeat(1000) }).
That would round-trip and compose reasonably well and wouldn't add another
special method that needs to be tested for at stringify time.
> Anders
>
>
>>
>> On Sun, Mar 18, 2018 at 9:33 PM, Michał Wadas <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Fact: JSON allows arbitrary precision numbers.
>> Problem: JavaScript is unable to express these numbers.
>>
>> Proposed solution: introduce JSON.safeParse. This method will work as
>> JSON.parse, but throwing on values that can't be accurately represented by
>> IEEE 754 64-bit float.
>>
>> Alternative: allow user to specify number class - eg. by adding
>> options object with optional method "parseNumber", overwriting default
>> behaviour of using builtin number type.
>>
>> Any thoughts on this?
>>
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