Demo with lazy mapping (and fix a bug)

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #24 into master will decrease coverage by 61.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #24       +/-   ##
==========================================
- Coverage   61.00%   0.00%   -61.01%     
==========================================
  Files           7       2        -5     
  Lines         159     115       -44     
==========================================
- Hits           97       0       -97     
- Misses         62     115       +53     

Flag	Coverage Δ
#unittests	0.00% <0.00%> (ø)

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Impacted Files	Coverage Δ
src/kernels.jl	0.00% <0.00%> (-44.15%)	⬇️
src/api.jl	0.00% <0.00%> (-100.00%)	⬇️
test/runtests.jl
examples/findminmax.jl
test/nogpu/test_histogram_msd.jl
test/test_findminmax.jl

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