[piyush295]

Fixes #1263.

Problem

InDeltaSlice only iterates over the actual slice, so two slices of different lengths can pass as long as every element of the shorter one matches:

assert.InDeltaSlice(t, []float64{1, 2}, []float64{1}, 0.001) // incorrectly passed

As @dolmen noted in the issue, this is inconsistent with InEpsilonSlice, which already enforces equal length via Len(t, actual, expectedLen), and it should be fixed without waiting for v2.0.0.

Fix

Add a length check to InDeltaSlice before the element-wise comparison, mirroring InEpsilonSlice:

if expectedSlice.Len() != actualSlice.Len() {
    return Fail(t, "Parameters must have the same number of elements", msgAndArgs...)
}

Testing

• Extended TestInDeltaSlice with both length-mismatch directions (shorter actual and longer actual); both now correctly fail.
• go test ./assert/ and go test ./require/ pass (no regression).
• go vet ./assert/ clean.