Some exponential notation strings are validated as unsafe numbers

[vvandens]

Support plan

• is this issue currently blocking your project? (yes/no): no
• is this issue affecting a production system? (yes/no): yes

Context

• node version: v12.22.6
• module version with issue: 17.4.2
• last module version without issue: N/A
• environment (e.g. node, browser, native): node
• used with (e.g. hapi application, another framework, standalone, ...): standalone
• any other relevant information:

What are you trying to achieve or the steps to reproduce?

const schema = Joi.number();
const validation = schema.validate('9.4e-1');
console.log(`value: ${validation.value}, message: ${validation.error}`);

What was the result you got?

value: 0.94, message: ValidationError: "value" must be a safe number

What result did you expect?

value: 0.94, message: undefined

I beleive that the problem lies in number.js#42 when the division hits a double precision value problem, i.e. :
0.94 / Math.pow(10, -1) results in 9.399999999999999

[martin-petersen]

I did a PR which once is approved gives the possibility to specify a precision number which will resolve the double precision number, but there is another way to resolve your problem and is by using:
const schema = Joi.number().unsafe();

[Marsup]

For reference, this is likely the same issue as in #2542.