different tests between curves

[tdhock]

• is the asymptotic complexity class the same? (slope difference on right)
• if so,
  • is the constant factor the same? (difference on right / big N)
  • is the constant overhead the same? (difference on the left / small N)

[tdhock]

this is a real example of a constant overhead time difference for small N.
Rdatatable/data.table#6925 (comment)