Loosen type constraints

[david-pl]

No description provided.

[codecov]

Codecov Report

Merging #28 (adc25b9) into master (992ebba) will increase coverage by 0.21%.
The diff coverage is 94.79%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   93.61%   93.82%   +0.21%     
==========================================
  Files          24       24              
  Lines        2473     2461      -12     
==========================================
- Hits         2315     2309       -6     
+ Misses        158      152       -6     

Impacted Files	Coverage Δ
src/spinors.jl	77.45% <77.77%> (+0.22%)	⬆️
src/states.jl	69.34% <79.31%> (ø)
src/pauli.jl	95.34% <86.36%> (-0.21%)	⬇️
src/operators_lazysum.jl	94.64% <90.00%> (+1.91%)	⬆️
src/operators_lazyproduct.jl	98.43% <90.90%> (+1.56%)	⬆️
src/operators_dense.jl	91.94% <91.11%> (+0.15%)	⬆️
src/superoperators.jl	82.65% <93.33%> (ø)
src/bases.jl	97.05% <100.00%> (+1.70%)	⬆️
src/fock.jl	100.00% <100.00%> (ø)
src/manybody.jl	99.59% <100.00%> (ø)
... and 13 more

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