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If I store an integer field in int32...will this use more space than int64? From what I understand the varint will adjust its size with the size of the number being stored.
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Protocol Buffers is a high-performance, compact binary wire format invented by Google who use it internally so they can communicate with their internal network services at very high speed.
Value represents a dynamically typed value which can be either null, a number, a string, a boolean, a recursive struct value, or a list of values.
Protocol buffers provide a language-neutral, platform-neutral, extensible mechanism for serializing structured data in a forward-compatible and backward-compatible way. It's like JSON, except it's smaller and faster, and it generates native language bindings.
Proto2: supports optional natively, the wrapper types were recommended but should be avoided in new applications. Proto3: originally did not support presence tracking for primitive fields. As of 2020, proto3 supports both optional fields which have has_foo() methods and "singular" fields, which do not.
No, this only impacts the generated code. Any combination of [s|u]int{32|64} uses "varint" encoding, so the size is generally related to the magnitude, at least after noting the difference in negative numbers. In particular, a negative number that doesn't use sint* will be disproportionately large (10 bytes, IIRC), regardless of whether it is 32 or 64.
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