Abstract type handling in cache changes

[ChrisRackauckas]

No description provided.

[codecov]

Codecov Report

Merging #549 into master will decrease coverage by 0.02%.
The diff coverage is 22.28%.

@@            Coverage Diff             @@
##           master     #549      +/-   ##
==========================================
- Coverage   33.54%   33.51%   -0.03%     
==========================================
  Files          81       81              
  Lines       23931    23613     -318     
==========================================
- Hits         8027     7914     -113     
+ Misses      15904    15699     -205

Impacted Files	Coverage Δ
src/caches/symplectic_caches.jl	63.39% <ø> (+11.18%)	⬆️
src/caches/linear_caches.jl	42.85% <ø> (+6.85%)	⬆️
src/caches/kencarp_kvaerno_caches.jl	20.2% <0%> (+1.85%)	⬆️
src/caches/bdf_caches.jl	11.85% <0%> (+0.81%)	⬆️
src/caches/rkn_caches.jl	62.5% <0%> (+8.01%)	⬆️
src/caches/adams_bashforth_moulton_caches.jl	26.39% <0%> (+1.66%)	⬆️
src/caches/rkc_caches.jl	50% <100%> (+7.14%)	⬆️
src/caches/generic_implicit_caches.jl	53.33% <100%> (-7.78%)	⬇️
src/caches/feagin_caches.jl	35.29% <100%> (-9.71%)	⬇️
src/caches/linear_nonlinear_caches.jl	48.64% <100%> (+1.7%)	⬆️
... and 14 more

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[coveralls]

Coverage decreased (-0.04%) to 32.052% when pulling c20a103 on caches into 6720551 on master.