set flag LeanMode.

static S loadTextFile_trim(S fileName) {
  ret trim(loadTextFile(fileName));
}

static S loadTextFile_trim(File f, S defaultContents) {
  ret trim(loadTextFile(f, defaultContents));
}

sS loadTextFile_trim(File fileName) {
  return trim(loadTextFile(fileName));
}

sS loadTextFile_trim(S fileName, S defaultContents) {
  ret trim(loadTextFile(fileName, defaultContents));
}

Began life as a copy of #1022206