func (w *QWriter) F(f float64) {
	n := int(f)
	if float64(n) == f {
		// Fast path - just int.
		w.D(n)
		return
	}

	// Slow path.
	w.FPrec(f, -1)
}
// F writes f to w.
F writes f to w.
// F writes f to w .
func (w *QWriter) F(f float64) {
	n := int(f)
	if float64(n) == f {
		w.D(n)
		return
	}
	w.FPrec(f, -1)
}
func ( w * QWriter ) F ( f float64 ) { n := int ( f ) if float64 ( n ) == f { w . D ( n ) return } w . FPrec ( f , - 1 ) }
F writes f to w.
F writes f to w .
// Fast path - just int. // Slow path.