contains constant trait

[codecov[bot]]

Codecov Report

Patch coverage: 87.87% and project coverage change: -0.76 :warning:

Comparison is base (2f401fa) 71.22% compared to head (54b5ddb) 70.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #486 +/- ## ========================================== - Coverage 71.22% 70.46% -0.76% ========================================== Files 80 81 +1 Lines 8331 8476 +145 ========================================== + Hits 5934 5973 +39 - Misses 2397 2503 +106 ``` | [Impacted Files](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | Coverage Δ | | |---|---|---| | [src/ApproxFunBase.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0FwcHJveEZ1bkJhc2Uuamw=) | `84.00% <ø> (+0.66%)` | :arrow_up: | | [src/LinearAlgebra/blas.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0xpbmVhckFsZ2VicmEvYmxhcy5qbA==) | `77.77% <ø> (ø)` | | | [src/Spaces/Spaces.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL1NwYWNlcy9TcGFjZXMuamw=) | `63.52% <ø> (-3.53%)` | :arrow_down: | | [src/Operators/qr.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9xci5qbA==) | `57.89% <22.22%> (-2.82%)` | :arrow_down: | | [src/Spaces/SumSpace.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL1NwYWNlcy9TdW1TcGFjZS5qbA==) | `70.44% <33.33%> (+0.77%)` | :arrow_up: | | [src/Operators/SubOperator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9TdWJPcGVyYXRvci5qbA==) | `82.35% <50.00%> (-0.82%)` | :arrow_down: | | [src/Spaces/ConstantSpace.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL1NwYWNlcy9Db25zdGFudFNwYWNlLmps) | `51.40% <58.82%> (-0.15%)` | :arrow_down: | | [src/Operators/banded/CalculusOperator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9iYW5kZWQvQ2FsY3VsdXNPcGVyYXRvci5qbA==) | `75.40% <80.64%> (+0.84%)` | :arrow_up: | | [src/Operators/functionals/CalculusFunctional.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9mdW5jdGlvbmFscy9DYWxjdWx1c0Z1bmN0aW9uYWwuamw=) | `79.48% <86.66%> (+7.07%)` | :arrow_up: | | [src/Operators/Operator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9PcGVyYXRvci5qbA==) | `70.66% <90.00%> (+3.08%)` | :arrow_up: | | ... and [9 more](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | | ... and [41 files with indirect coverage changes](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/486/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation)

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