Get started on serializing references, closes #790

[fasterthanlime]

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📦 limpid report

Number of crates: 51 (➖ no change)

Crate	Baseline Size	Current Size	Change
std	510.9 KB	510.6 KB	📉 -263 B
facet_core	19.3 KB	19.2 KB	📉 -21 B
facet_reflect	31.9 KB	31.9 KB	📈 +5 B
facet_serialize	23.5 KB	23.5 KB	📉 -1 B

All significant changes are listed above.

8350 symbols (➖ no change), totaling 885.5 KB (📉 -352 B)

Symbol	Baseline Size	Current Size	Change
core::ops::function::FnOnce::call_once found in std	102.4 KB	102.1 KB	📉 -263 B
facet_core::typeid::of found in facet_core	4.0 KB	4.0 KB	📉 -21 B
facet_reflect::partial::Partial::begin_smart_ptr found in facet_reflect	953 B	958 B	📈 +5 B
facet_core::types::def::list::ListDef::t found in facet_core	3 B	—	🗑️ REMOVED
facet_core::types::def::set::SetDef::t found in facet_core	—	3 B	🆕 NEW
facet_serialize::serialize_iterative found in facet_serialize	23.5 KB	23.5 KB	📉 -1 B

All significant changes are listed above.

Number of LLVM lines: 351,318 (📉 -54)

Function	Baseline Lines	Current Lines	Change
core::ops::function::FnOnce::call_once found in core	25,339	25,289	📉 -50
facet_serialize::serialize_iterative found in facet_serialize	4,920	4,917	📉 -3
facet_core::typeid::of found in facet_core	208	207	📉 -1

All significant changes are listed above.

Wall duration: 6.10 s (📉 -0.16 s)