v0.4.48

Transducers v0.4.48

Diff since v0.4.47

Merged pull requests:

• Add a specialized fold for CartesianIndices (#400) (@tkf)
• "Nested loops" for threaded fold; option to convert Cat to TCat (#401) (@tkf)
• Add more specialization hints to the compiler (#402) (@tkf)
• Tail-call function-barrier for arrays (#403) (@tkf)
• Specialize foldl for cartesian style arrays (#407) (@tkf)
• Define is_prelude on Tuple and NamedTuple (#408) (@tkf)
• Improve compilation latency by reducing recursion limit (#413) (@tkf)