define: DUK_USE_FASTINT
requires:
  - DUK_USE_64BIT_OPS
introduced: 1.2.0
default: false
tags:
  - performance
  - fastpath
description: >
  Enable support for 48-bit signed "fastint" integer values.  Fastints are
  transparent to user code (both C and Ecmascript) but may be faster than
  IEEE doubles on some platforms, especially those using softints.  The
  downside of fastints is increased code footprint and a small performance
  penalty for some kinds of code.