Backport: Don't unwrap conversion

[codecov[bot]]

Codecov Report

Patch coverage: 63.63% and project coverage change: +0.22% :tada:

Comparison is base (42a2c04) 71.00% compared to head (1c96e8a) 71.23%. Report is 2 commits behind head on backport_0.8.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## backport_0.8 #546 +/- ## ================================================ + Coverage 71.00% 71.23% +0.22% ================================================ Files 81 81 Lines 8575 8589 +14 ================================================ + Hits 6089 6118 +29 + Misses 2486 2471 -15 ``` | [Files Changed](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | Coverage Δ | | |---|---|---| | [src/LinearAlgebra/lyap.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0xpbmVhckFsZ2VicmEvbHlhcC5qbA==) | `0.00% <0.00%> (ø)` | | | [src/Multivariate/VectorFun.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL011bHRpdmFyaWF0ZS9WZWN0b3JGdW4uamw=) | `57.73% <0.00%> (ø)` | | | [src/PDE/KroneckerOperator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL1BERS9Lcm9uZWNrZXJPcGVyYXRvci5qbA==) | `78.43% <85.71%> (+0.11%)` | :arrow_up: | | [src/Operators/Operator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9PcGVyYXRvci5qbA==) | `73.95% <100.00%> (-0.06%)` | :arrow_down: | | [src/Operators/banded/Conversion.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9iYW5kZWQvQ29udmVyc2lvbi5qbA==) | `86.15% <100.00%> (+2.28%)` | :arrow_up: | | [src/Operators/general/algebra.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9nZW5lcmFsL2FsZ2VicmEuamw=) | `90.12% <100.00%> (ø)` | | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/546/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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