[Feature Request]: support truncated function to cut off mantissa

[axetroy]

Fake API

const number = 12.3456
new Big(number).truncate(3) // 12.345 truncate 3 decimal places
number.toFixed(3) // 12.346 rounding

[MikeMcl]

See round and Big.RM.

const number = 12.3456
Big.RM = 0    // ROUND_DOWN i.e. truncate
new Big(number).round(3)    // 12.345
number.toFixed(3)    // 12.345

or leave Big.RM alone and pass a rounding mode

const number = 12.3456
const truncate = 0
new Big(number).round(3, truncate)    // 12.345