While we support initializing records via coercion from an expression
list, e.g.,
local x: X = [$x1=1, $x2=2];
this can sometimes obscure the code to readers, e.g., when assigning to
value declared and typed elsewhere. The language runtime has a similar
overhead since instead of just constructing a known type it needs to
check at runtime that the coercion from the expression list is valid;
this can be slower than just writing the readible code in the first
place, see #4559.
With this patch we use explicit construction, e.g.,
local x = X($x1=1, $x2=2);
The seen/file-names script relies on f$info$filename to be populated.
For HTTP and other network protocols, however, this field is only
populated during file_over_new_connection() that's running after
file_new().
Use the file_new() event only for files without connections and
file_over_new_connection() implies that f$conns is populated, anyway.
Special case SMB to avoid finding files twice, because there's a
custom implementation in seen/smb-filenames.zeek.
Fixes#2647
