There is a option -smallframes that seems to be intended for conservative use cases. Below are the related configs and a test at what point they escape (+1).

  // -smallframes
  // ir.MaxStackVarSize = 64 * 1024
  // ir.MaxImplicitStackVarSize = 16 * 1024
  a := [64 * 1024 +1]byte{}
  b := make([]byte, 0, 16 * 1024 +1)
  // default
  // MaxStackVarSize = int64(128 * 1024)
  // MaxImplicitStackVarSize = int64(64 * 1024)
  c := [128 * 1024 +1]byte{}
  d := make([]byte, 0, 64 * 1024 +1)

  test/test.go:36:2: moved to heap: c

> Not sure how to verify this, but the assumption you can allocate megabytes on the stack seems wrong.

    []byte{N: 0}