floor, ceil, round called with (::Type{T}, ::SArray) allocates

using BenchmarkTools, StaticArrays
x = SVector(0., 1.)
@btime round.(Int, $x) # 11.817 ns (1 allocation: 16 bytes)
@btime floor.(Int, $x) # 11.723 ns (1 allocation: 16 bytes)
@btime ceil.(Int, $x) # 11.754 ns (1 allocation: 16 bytes)

There seems to be no type instability.

julia> @code_warntype round.(Int, x)
MethodInstance for (::var"##dotfunction#439#69")(::Type{Int64}, ::SVector{2, Float64})
  from (::var"##dotfunction#439#69")(x1, x2) in Main
Arguments
  #self#::Core.Const(var"##dotfunction#439#69"())
  x1::Core.Const(Int64)
  x2::SVector{2, Float64}
Body::SVector{2, Int64}
1 ─ %1 = Base.broadcasted(Main.round, x1, x2)::Base.Broadcast.Broadcasted{StaticArrays.StaticArrayStyle{1}, Nothing, typeof(round), Tuple{Base.RefValue{Type{Int64}}, SVector{2, Float64}}}
│   %2 = Base.materialize(%1)::SVector{2, Int64}
└──      return %2

julia> versioninfo()
Julia Version 1.7.0
Commit 3bf9d17731 (2021-11-30 12:12 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, haswell)
Environment:
  JULIA = /home/jmlim/appl/julia-1.7.0/bin/julia

(@v1.7) pkg> status StaticArrays
      Status `~/.julia/environments/v1.7/Project.toml`
  [90137ffa] StaticArrays v1.3.4

Start by reproducing the BenchmarkTools examples for round.(Int, x), floor.(Int, x), and ceil.(Int, x) with the reported StaticArrays setup. Inspect the Base.broadcasted and Base.materialize path using StaticArrayStyle; done means these calls preserve the SVector result without the reported 16-byte allocation.