Prettier formatting of ternaries

gistfile1.txt

// Original code
const score = 7;
const someVar =
  score < 10 ? 'some long string' :
  score < 20 ? 'this is looking promising' :
  score < 30 ? 'passing' :
  score < 40 ? 'proficient' :
  'expert';

// What Prettier does
const score = 7;
const someVar =
  score < 10
    ? 'some long string'
    : score < 20
      ? 'this is looking promising'
      : score < 30 ? 'passing' : score < 40 ? 'proficient' : 'expert';
// Why does the last line contain more than one condition?
// In function definitions Prettier either puts all the parameters on the same line
// or each one on a separate line.  Ternaries should be the same ...
// either all conditions on one line or each on a separate line.

Okay, I just filed prettier/prettier#4087.