The type was a record struct whose ==/Equals/GetHashCode were
synthesized from all fields, including the _sets array, so two
ranges that parse to the same constraint sets compared as
unequal (reference-sensitive on the array). This also broke
using ranges as dictionary keys, where lookup relies on value
equality.
Change the type to a plain readonly struct implementing
IEquatable<SemanticVersionRange> with structural equality over
the constraint sets (operation + version per comparator). The
custom ToString already existed, so no display behaviour is lost.
Add a failing-then-passing test.
TryFormat for the "ns" format returned false for any set that can
not be expressed as a caret/tilde range. The public ToString
routes through DefaultInterpolatedStringHandler, whose buffer-full
fallback re-enters ToString, causing an infinite loop / stack overflow.
For "ns", fall back to the full comparator ("n") form when the
compact form cannot represent the set, so the call always succeeds
for a representable range. A genuine buffer overflow still returns
false as before.
Add failing-then-passing tests.
Build metadata does not affect precedence (SemVer 2.0.0 §10), so
the Eq and Neq constraints now use SemanticVersionComparer.Priority
instead of the structural == operator. This makes [1.2.3] match
1.2.3+build, consistent with precedence semantics.
Add a failing-then-passing test.
