Follow Rust API guidelines

[kvark]

https://github.com/brson/rust-api-guidelines

[vitvakatu]

Well, here it is the checklist for this issue.

• Organization (crate is structured in an intelligible way)
  • [x] Crate root re-exports common functionality ([C-REEXPORT])
  • [x] Modules provide a sensible API hierarchy ([C-HIERARCHY])
• Naming (crate aligns with Rust naming conventions)
  • [x] Casing conforms to RFC 430 ([C-CASE])
  • [x] Ad-hoc conversions follow as_, to_, into_ conventions ([C-CONV])
  • [x] Methods on collections that produce iterators follow iter, iter_mut, into_iter ([C-ITER])
  • [x] Iterator type names match the methods that produce them ([C-ITER-TY])
  • [x] Ownership suffixes use _mut and _ref ([C-OWN-SUFFIX])
  • [x] Single-element containers implement appropriate getters ([C-GETTERS])
• Interoperability (crate interacts nicely with other library functionality)
  • [x] Types eagerly implement common traits ([C-COMMON-TRAITS])
  • Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash Debug, Display, Default
  • [x] Conversions use the standard traits From, AsRef, AsMut ([C-CONV-TRAITS])
  • [ ] Collections implement FromIterator and Extend ([C-COLLECT])
  • [ ] Data structures implement Serde's Serialize, Deserialize ([C-SERDE])
  • [ ] Crate has a "serde" cfg option that enables Serde ([C-SERDE-CFG])
  • [x] Types are Send and Sync where possible ([C-SEND-SYNC])
  • [x] Error types are Send and Sync ([C-SEND-SYNC-ERR])
  • [x] Error types are meaningful, not () ([C-MEANINGFUL-ERR])
  • [x] Binary number types provide Hex, Octal, Binary formatting ([C-NUM-FMT])
• Macros (crate presents well-behaved macros) We don't have any macros atm
  • [x] Input syntax is evocative of the output ([C-EVOCATIVE])
  • [x] Macros compose well with attributes ([C-MACRO-ATTR])
  • [x] Item macros work anywhere that items are allowed ([C-ANYWHERE])
  • [x] Item macros support visibility specifiers ([C-MACRO-VIS])
  • [x] Type fragments are flexible ([C-MACRO-TY])
• Documentation (crate is abundantly documented)
  • [x] Crate level docs are thorough and include examples ([C-CRATE-DOC])
  • [x] All items have a rustdoc example ([C-EXAMPLE])
  • [x] Examples use ?, not try!, not unwrap ([C-QUESTION-MARK])
  • [x] Function docs include error conditions in "Errors" section ([C-ERROR-DOC])
  • [x] Function docs include panic conditions in "Panics" section ([C-PANIC-DOC])
  • [x] Prose contains hyperlinks to relevant things ([C-LINK])
  • [ ] Cargo.toml publishes CI badges for tier 1 platforms ([C-CI])
  • [x] Cargo.toml includes all common metadata ([C-METADATA])
  • authors, description, license, homepage, documentation, repository, readme, keywords, categories
  • [x] Crate sets html_root_url attribute "https://docs.rs/$crate/$version" ([C-HTML-ROOT])
  • [x] Cargo.toml documentation key points to "https://docs.rs/$crate" ([C-DOCS-RS])
• Predictability (crate enables legible code that acts how it looks)
  • [x] Smart pointers do not add inherent methods ([C-SMART-PTR]) It's not obvious, but Pointer and WeakPointer aren't smart pointers, so we have downgrade and upgrade.
  • [x] Conversions live on the most specific type involved ([C-CONV-SPECIFIC])
  • [x] Functions with a clear receiver are methods ([C-METHOD])
  • [x] Functions do not take out-parameters ([C-NO-OUT])
  • [x] Operator overloads are unsurprising ([C-OVERLOAD])
  • [x] Only smart pointers implement Deref and DerefMut ([C-DEREF])
  • [x] Deref and DerefMut never fail ([C-DEREF-FAIL])
  • [x] Constructors are static, inherent methods ([C-CTOR])
• Flexibility (crate supports diverse real-world use cases)
  • [ ] Functions expose intermediate results to avoid duplicate work ([C-INTERMEDIATE])
  • [ ] Caller decides where to copy and place data ([C-CALLER-CONTROL])
  • [ ] Functions minimize assumptions about parameters by using generics ([C-GENERIC])
  • [ ] Traits are object-safe if they may be useful as a trait object ([C-OBJECT])
• Type safety (crate leverages the type system effectively)
  • [ ] Newtypes provide static distinctions ([C-NEWTYPE])
  • [ ] Arguments convey meaning through types, not bool or Option ([C-CUSTOM-TYPE])
  • [ ] Types for a set of flags are bitflags, not enums ([C-BITFLAG])
  • [ ] Builders enable construction of complex values ([C-BUILDER])
• Dependability (crate is unlikely to do the wrong thing)
  • [ ] Functions validate their arguments ([C-VALIDATE])
  • [x] Destructors never fail ([C-DTOR-FAIL])
  • [x] Destructors that may block have alternatives ([C-DTOR-BLOCK])
• Debuggability (crate is conducive to easy debugging)
  • [x] All public types implement Debug ([C-DEBUG])
  • [x] Debug representation is never empty ([C-DEBUG-NONEMPTY])
• Future proofing (crate is free to improve without breaking users' code)
  • [x] Structs have private fields ([C-STRUCT-PRIVATE])
  • [x] Newtypes encapsulate implementation details ([C-NEWTYPE-HIDE])
• Necessities (to whom they matter, they really matter)
  • [x] Public dependencies of a stable crate are stable ([C-STABLE])
  • [x] Crate and its dependencies have a permissive license ([C-PERMISSIVE])