Efficient Repeat: Array of single value

I want to define defaults for a read-only AbstractVector{Bool} argument to a function and so far used falses(n). However, this allocates a full BitArray.
I guess should be a type similar to a Range that can do this job, similar to:

struct Repeat{T,N} end
Base.getindex(r::Repeat{T,N},i::Int) where {T,N} = 
    (1 <= i <= N) ? T : throw(BoundsError(r,i))
Base.length(r::Repeat{T,N}) where {T,N} = N

Before I invest much time in developing such a type with the full Array interface, I ask how such cases are handled so far in Julia?

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