\version "2.12.0"

\header {
  texidoc = "Beamed stems have standard lengths if possible.  Quantization
is switched off in this example."
}

\relative c' {
  \override Beam #'positions =
  #(ly:make-simple-closure
    (ly:make-simple-closure
     (list chain-grob-member-functions
      `(,cons 0 0)
      ly:beam::calc-least-squares-positions
      ly:beam::slope-damping
      ly:beam::shift-region-to-valid
    )))

  f4  f8[ f]  f16[ f]  f32[ f]  f64[ f]  f128[ f]
}