Evaluate with scope ignores BigNumber

[saschb2b]

I'm a little bit confused on when the configuration actually is used.

This is my config

// create a mathjs instance with configuration
const config = {
  number: 'BigNumber',
  precision: 64,
}
const mathjs = create(all, config)

My calculation is as follows x / a * b
Where as

x = 4799
a = 40
b = 44

// 52798.899999999994
console.log('normal js', 4799 / 40 *  44); 

// 52798.899999999994 <- I've read in the docs that number from configs is ignored here
console.log('mathjs functions', mathjs.multiply((mathjs.divide(x, a)), b)) 

// 52798.9 <- this I want all the time
console.log('mathJS evaluate', mathjs.evaluate(`47999 / 40 * 44`)); 

// 52798.899999999994 <- why is BigNumber ignored?
console.log('mathJS evaluate scope', mathjs.evaluate('x / a * b', {
    x: 47999,
    a: 40,
    b: 44,
 }));

Expected behaviour:
evaluate(expression, scope) should be the same as evaluate(expression))

Installed version 6.2.5

[josdejong]

This can be indeed confusing.

The behavior is:

• when any function receives numeric input (number, BigNumber, etc.), it uses that input as is.
• when any function needs to parse a string into a numeric value, it uses config.number to determine how to parse the string (i.e. into a number, BigNumber, ...)

Does that help?