don't bother asserting enum string serialization?

[turbomam]

class	slot	action	target	value
soil_emsl_jgi_mg	biotic_relationship	replace_attribute	string_serialization	enumeration
soil_emsl_jgi_mg	growth_facil	replace_attribute	string_serialization	enumeration
soil_emsl_jgi_mg	rel_to_oxygen	replace_attribute	string_serialization	enumeration
soil_emsl_jgi_mg	store_cond	replace_attribute	string_serialization	enumeration

[turbomam]

env_package tie-in	LinkML slot name	range	string serialization
soil_emsl_jgi_mg	analysis_type	analysis_type_enum	enumeration
soil_emsl_jgi_mg	sample_type	sample_type_enum	enumeration
soil_emsl_jgi_mg	dna_cont_type	dna_cont_type_enum	enumeration
soil_emsl_jgi_mg	dna_sample_format	dna_sample_format_enum	enumeration
soil_emsl_jgi_mg	dna_dnase	dna_dnase_enum	enumeration
soil_emsl_jgi_mt	rna_cont_type	rna_cont_type_enum	enumeration
soil_emsl_jgi_mt	rna_sample_format	rna_sample_format_enum	enumeration
soil_emsl_jgi_mt	dnase_rna	dnase_rna_enum	enumeration
soil_emsl_jgi_mg	env_package	env_package_enum	enumeration

[turbomam]

from_val	from_type	to_type	to_val
analysis_type_enum	linkml range	DH datatype	select
cur_land_use_enum	linkml range	DH datatype	select
dna_cont_type_enum	linkml range	DH datatype	select
dna_dnase_enum	linkml range	DH datatype	select
dna_sample_format_enum	linkml range	DH datatype	select
drainage_class_enum	linkml range	DH datatype	select
enumeration	MIxS string serialization	DH datatype	select
env_package_enum	linkml range	DH datatype	select
fao_class_enum	linkml range	DH datatype	select
growth_facility_enum	linkml range	DH datatype	select
oxy_stat_samp_enum	linkml range	DH datatype	select
oxygen_relationship_enum	linkml range	DH datatype	select
profile_position_enum	linkml range	DH datatype	select
samp_biotic_relationship_enum	linkml range	DH datatype	select
sample_type_enum	linkml range	DH datatype	select
soil_horizon_enum	linkml range	DH datatype	select
storage_condt_enum	linkml range	DH datatype	select
tillage_enum	linkml range	DH datatype	select