SVector sometimes allocates

This does not allocate

const v=[1]
const vl=length(v)
   
function g()
   SVector{vl, Int}(v)
end

@timev g()

  0.000001 seconds
elapsed time (ns):  769
gc time (ns):       0
bytes allocated:    0
pool allocs:        0
non-pool GC allocs: 0
minor collections:  0
full collections:   0

But this allocates:

const v=[1]

function g()
   vl=length(v)
   SVector{vl, Int}(v)
end

@timev g()

  0.000017 seconds (10 allocations: 528 bytes)
elapsed time (ns): 17108
bytes allocated:   528
pool allocs:       10
1-element SVector{1, Int64} with indices SOneTo(1):
 1

julia> @allocated g()
528

Using @SVector is not an option for me due to #1014

Reproduce the two g() examples from the issue in Julia, comparing @timev and @allocated when vl is a constant versus a local length(v) value. Trace the SVector{vl, Int}(v) construction and inspect issue #1014 for the stated constraint; done means the local-length form no longer incurs the reported allocations without relying on @SVector.